pref. 在...下, 在...中, 副, 亚, 次, 不全

[医] 在下, 下; 不足, 不全; 次, 亚(化学)

Sub- \Sub-\ [L. sub under, below; akin to Gr. ?, Skr. upa to,
on, under, over. Cf. {Hypo-}, {Super-}.]
1. A prefix signifying under, below, beneath, and hence
often, in an inferior position or degree, in an imperfect
or partial state, as in subscribe, substruct, subserve,
subject, subordinate, subacid, subastringent, subgranular,
suborn. Sub- in Latin compounds often becomes sum- before
m, sur before r, and regularly becomes suc-, suf-, sug-,
and sup- before c, f, g, and p respectively. Before c, p,
and t it sometimes takes form sus- (by the dropping of b
from a collateral form, subs-).

2. (Chem.) A prefix denoting that the ingredient (of a
compound) signified by the term to which it is prefixed,is
present in only a small proportion, or less than the
normal amount; as, subsulphide, suboxide, etc. Prefixed to
the name of a salt it is equivalent to basic; as,
subacetate or basic acetate. [Obsoles.]