- A prefix denoting that the element to the name of which it is prefixed enters with a low valence or in a low state of oxidization, usually the lowest, into the compounds indicated; as, hyposulphurous acid.
- A prefix signifying a less quantity or a low state or degree, of that denoted by the word with which it is joined or position under or beneath.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Hypo-. Retrieved September 21, 2026, from http://smartdefine.org/hypo-/definitions/2018390 |
| Chicago | Webster's. 2011. "Hypo-" http://smartdefine.org/hypo-/definitions/2018390 (accessed September 21, 2026). |
| Harvard | Webster's 2011, Hypo-, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/hypo-/definitions/2018390>. |
| MLA | Webster's. "Hypo-" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/hypo-/definitions/2018390> |