Sub-

Definition of Sub-

	1.	A prefix signifying under, below, beneath, and hence often, in an inferior position or degree, in an imperfect or partial state, as in sub scribe, sub struct, sub serve, sub ject, sub ordinate, sub acid, sub astringent, sub granular, sub orn. 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, sub sulphide, sub oxide, etc. Prefixed to the name of a salt it is equivalent to basic; as, sub acetate or basic acetate.

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