- (a.) Having a valence or combining power of two; capable of being substituted for, combined with or replaced by, two atoms of hydrogen; as, oxygen and calcium are dyad elements. See Valence.
- (n.) Two units treated as one; a couple; a pair.
- (n.) An element, atom or radical having a valence or combining power of two.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). dyad. Retrieved September 22, 2026, from http://smartdefine.org/dyad/definitions/2001147 |
| Chicago | Webster's. 2011. "dyad" http://smartdefine.org/dyad/definitions/2001147 (accessed September 22, 2026). |
| Harvard | Webster's 2011, dyad, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/dyad/definitions/2001147>. |
| MLA | Webster's. "dyad" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/dyad/definitions/2001147> |