派生
ad-
- Important derivatives are: at1 aid
重要派生词为： at1 aid - To, near, at.
朝向, 接近, 在. - ado , at 1 , from Old English æt , near, by, at, and from Middle English at , “to,” from Old Norse at , both from Germanic *at .
ado , at 1 , 源自 古英语 æt , 接近, 经过, 在, 并且源自 中古英语 at , “向,” 源自 古斯堪的纳维亚语 at , 两者都源自 日耳曼语 *at . - ad- , -ad ; ( adjuvant ), aid , amount , ( paramount ), from Latin ad , ad- , to, toward.
ad- , -ad ; ( adjuvant ), aid , amount , ( paramount ), 源自 拉丁语 ad , ad- , 朝向, 向.
语源
- Pokorny 1.ad- 3.
波科尔尼 1.ad- 3.
ad-
pref.（前缀）
- ac- or af- or ag- or al- or ap- or as- or at- Toward; to. Beforec, f, g, k, l, p, q, s, and t, ad- is usually assimilated to ac-, af-, ag-, ac-, al-, ap-, ac-, as-, and at-, respectively.
ac- 或 af- 或 ag- 或 al- 或 ap- 或 as- 或 at- 往，向：朝…方向；朝向。在c-，f，g，k，l，p，q，s， 以及 t之前时，ad- 通常各自同化为 ac-，af-，ag-，ac-，al-，ap-，ac-，as- 以及 at- - Near; at:
在…附近；邻近…：
adrenal.
肾上腺的
语源
- Latin
拉丁语 - from ad [to] * see ad-
源自 ad [向…] *参见 ad-
ad-
prefix
to; towards
⇒
adsorb
⇒
adverb
near; next to
⇒
adrenal
Origin
from Latin: to, towards. As a prefix in words of Latin origin, ad- became ac-, af-, ag-, al-, an-, acq-, ar-, as-, and at- before c, f, g, l, n, q, r, s, and t, and became a- before gn, sc, sp, stad-
Word Origin
1
a prefix occurring in loanwords from Latin, where it meant “toward” and indicated direction, tendency, or addition: adjoin. Usually assimilated to the following consonant; see a-5, ac-, af-, ag-, al-, an-2, ap-1, ar-, as-, at-.
Origin
< Latin ad, ad- (preposition and prefix) to, toward, at, about; cognate with at1
ad-a prefix of direction, tendency, and addition, attached chiefly to stems not found as words themselves, as in advert, advent.
Also, ac-, af-, ag-, al-, an-, ap-, ar-, as-, at-, a-. [Latin, representing ad (preposition) to, towards, at, about]
ad-
prefix
or ac- or af- or ag- or al- or ap- or as- or at-
acculturation
and af- before f
affluent
and ag- before g
aggradation
and al- before l
alliteration
and ap- before p
apportion
and as- before s
assuasive
and at- before t
attune
and ad- before other sounds but sometimes ad- even before one of the listed consonants
adsorb
2. near : adjacent to — in this sense always in the form ad-
adrenal
prefix
or ac- or af- or ag- or al- or ap- or as- or at-
ETYMOLOGY Middle English, from Anglo-French & Latin; Anglo-French, from Latin, from ad — more at at
1. to : toward — usually ac- before c, k, or qacculturation
and af- before f
affluent
and ag- before g
aggradation
and al- before l
alliteration
and ap- before p
apportion
and as- before s
assuasive
and at- before t
attune
and ad- before other sounds but sometimes ad- even before one of the listed consonants
adsorb
2. near : adjacent to — in this sense always in the form ad-
adrenal
ad-
prefix
- denoting motion or direction to表示“往”, “向…”：
-
advance
adduce.
- ■ reduction or change into表示“减少”, “变成”：
-
adapt
adulterate.
- ■ addition, increase, or intensification表示“添加”, “增长”, “加剧”：
-
adjunct.
USAGEAd- is also found assimilated in the following forms：a- before sc, sp, st; ac- before c, k, q; af- before f; ag- before g; al- before l; an- before n; ap- before p; ar- before r; as- before s; at- before t.
词源
from Latin ad 'to'; in the 16th cent. the use of ad- and its variants was extended to replace a- from a different origin such as Latin ab- （e.g. advance, from French avancer based on late Latin abante 'in front'）.
ad-
word-forming element expressing direction toward or in addition to, from Latin ad "to, toward" in space or time; "with regard to, in relation to," as a prefix, sometimes merely emphatic, from PIE *ad- "to, near, at" (cognate with Old English æt; see at). Simplified to a- before sc-, sp- and st-; modified to ac- before many consonants and then re-spelled af-, ag-, al-, etc., in conformity with the following consonant (as in affection, aggression). In Old French, reduced to a- in all cases (an evolution already underway in Merovingian Latin), but written forms in French were refashioned after Latin in 14c. and English did likewise 15c. in words it had picked up from Old French. In many cases pronunciation followed the shift.
☞ ad
ad-
prefix
or ac- or af- or ag- or al- or ap- or as- or at-
Etymology: ad- from Middle English, from Latin, from ad; ac- from Middle English, from Old French, from Latin, from ad; af- from Middle English, from Old French, from Latin, from ad; ag- from Middle English, from Middle French, from Latin, from ad; al- from Middle English, from Middle French, from Latin, from ad; ap- from Middle English, from Middle French, from Latin, from ad; as- from Middle English, from Old French, from Latin, from ad; at- from Middle English, from Old French, from Latin, from ad — more at at
1. : to : toward — usually ac- before c, k, or q
< acculturation >
and af- before f
< afformative >
and ag- before g
< aggradation >
and al- before l
< allineation >
and ap- before p
< appersonation >
and as- before s
< asself >
and at- before t
< attune >
and ad- before other sounds
< adnominal >
< adverbial >
but sometimes ad- even before one of the listed consonants
< adpronominal >
2. : near : adjacent to — in this sense always in the form ad-
< adoral >
< adrenal >
or ac- or af- or ag- or al- or ap- or as- or at-
1.
< acculturation >
and af- before f
< afformative >
and ag- before g
< aggradation >
and al- before l
< allineation >
and ap- before p
< appersonation >
and as- before s
< asself >
and at- before t
< attune >
and ad- before other sounds
< adnominal >
< adverbial >
but sometimes ad- even before one of the listed consonants
< adpronominal >
2.
< adoral >
< adrenal >
ad-
Prefix
- near, at.
- adrenal.
- toward, to, tendency, or addition.
- adjoin.
Etymology
from the Latin prefix ad-.
References
前缀：ad- 加在在单词或词根前, 表示"做…, 加强…"
adapt 适应（ad+apt能力→有适应能力）
adept 熟练的（ad+ept能力→有做事能力→熟练的）
adopt 收养；采纳（ad+opt选择→选出来→采纳）
adhere 坚持（ad+here粘→粘在一起→坚持）
adjacent 邻近的（ad+jacent躺→躺在一起→邻近的）
adjoin 贴近；毗连（ad+join参加→参加在一起→贴近）
administrate 管理；执行（ad+ministr部长+ate→做部长→管理）
admire 羡慕（ad+mire惊奇→惊喜；羡慕）
adumbrate 预示（ad+umbr影子+ate→[将来的]影子出现→预示）
adjust 调整（ad+just+正确→弄正确→调整）
adventure 冒险（ad+venture冒险）
admonish 告诫，警告（ad+mon警告+ish→一再警告）
advent 来临，来到（ad+vent来→来到）
前缀：ad- 含有at, to之意, 或表示加强意义
adjust 调整
admixture 混杂
adventure 冒险
adjunction 添加，附加
admonition 告诚，劝告
adjoin 峨连，相接，贴近
前缀：ad-
【词根含义】：来,临近;朝,向,趋向;加强意义
【词根来源】：来源于拉丁语前缀ad-。
【同源单词】：adapt, adaptable, adaptation, adaptive, addict
词根词缀：ad-
【来源及含义】Latin: prefix; to, toward, a direction toward, addition to, near, at; and changes to: ac-, af-, ag-, al-, an-, ap-, aq-, ar-, as-, at- when ad- is combined with certain words that begin with the letters c, f, g, l, n, p, q, r, s, and t
【相关描述】The form ad- appears in this form before a vowel and before the consonants d, h, j, m, and v. It is simplified to a- before sc, sp and st.
Before c, f, g, l, n, p, q, r, s, and t; ad- is changed to ac-, af-, ag-, al-, an-, ap-, aq-, ar-, as-, and at-.
In other words, the d of ad usually changes into the same letter as the first letter of the following root or word when it is a consonant: ad-fix becomes affix, and ad-sign becomes assign; therefore, making a double consonant.
Another example includes: attract as with ad-tract (drawn towards); so it has a double t. On the other hand when ad- precedes a vowel, as with adapt, it is simply ad-apt, with one d. For the same reason, there is only one d in adore and adumbrate, because ad- has combined with orare and umbra each of which starts with a vowel.
So, remember: since these Latin words begin with vowels and not consonants, the d of ad does not double as shown in the previous examples.
【同源单词】a capite ad calcem, Ab ovo usque ad mala, Ab uno ad omnes, Abiit ad majores, abjure, accede