adjunct
n.
1580s, from Latin adiunctus "closely connected, joined, united" (as a noun, "a characteristic, essential attribute"), past participle of adiungere "join to" (see adjoin).
adj.
1590s, from Latin adiunctus "closely connected, joined, united," past participle of adiungere "join to" (see adjoin). Adjunct professor is 1826, American English.
〔蒋〕[ad-表示to，junct连接，’连接在他物之上”] 附属物，附属品，附加语，修饰语，附属的
〔李〕[ad-=to于；junct=to join连接→“being joined to a main body被连接在主体上”→]Ⅰa. subordinate;secondary附属的；次要的