- 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-).
- 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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). sub-. Retrieved September 20, 2026, from http://smartdefine.org/sub-/definitions/2067481 |
| Chicago | Webster's. 2011. "sub-" http://smartdefine.org/sub-/definitions/2067481 (accessed September 20, 2026). |
| Harvard | Webster's 2011, sub-, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/sub-/definitions/2067481>. |
| MLA | Webster's. "sub-" 28 May 2011. Web. 20 September 2026. <http://smartdefine.org/sub-/definitions/2067481> |