bis-
combining form
- Chemistry used to form the names of compounds containing two groups identically substituted or coordinated【化】表示“两”, “双”（用以构成化合物名称）：
-
bis(2-aminoethyl) ether.
1931 Jrnl. Chem. Soc. i. 1616The prefixes di-, tri-, tetra-, etc., will be used before simple expressions..and the prefixes bis, tris, tetrakis, etc., before complex expressions.
1974 R. S. Cahn Introd. Chem. Nomencl. (ed. 4) iii. 42Multiplicative prefixes bis-, tris-, tetrakis-, etc. are used in America for all complex expressions.
1975 R. F. Brown Org. Chem. iv. 74If complex substituents enclosed in parentheses are present more than once, we use the special multiplying prefixes of bis, tris, tetrakis, and so on, instead of di, tri, tetra, and so on.
1984 Greenwood & Earnshaw Chem. of Elements (1986) viii. 374Bis (η6-arene) metal complexes have been made for many transition metals by the Al/AlCl3 reduction method.
1863 Watts Dict. Chem. I. 596.
bis-
word-forming element meaning "twice," from Latin bis "twice, in two ways, doubly," from Old Latin dvis, cognate with Sanskrit dvih, Avestan bish, Greek dis, Middle High German zwis "twice," from PIE *dwo- "two" (see two). Also the form of bi- used before -s-, -c-, or a vowel.
bis-
combining form
Etymology: Latin, from bis
1.
a. : both : of or belonging to both — chiefly in anatomical or medical words of which the second constituent begins with a vowel
< bisischiatic >
b. : two
< bismarine >
2. : twice : doubled — especially in complex chemical expressions
< bisdimethylamino- >
< bisquarternary >
1.
a.
< bisischiatic >
b.
< bismarine >
2.
< bisdimethylamino- >
< bisquarternary >
bis-
Prefix
- An occasional variant of bi- prefixed to roots beginning with a vowel, as in bisalternate
- chemistry, obsolete A variant of tri- used to indicate that the component that does not take the prefix occurs twice in the compound: a bisoxide is of the form B2O
- mathematics, chemistry A variant of di-, used for substitutions of two complex rather than simple units.
- Bis (η6-arene) metal complexes have been made for many transition metals by the Al/AlCl3 reduction method.