GNU Collaborative International Dictionary of English

last match results

Found 2 definitions

1.       
   Dyad , n. [L. dyas, dyadis, the number two. Gr. : cf. F. dyade. See two, and cf. Duad.]
   Two units treated as one; a couple; a pair.
   1913 Webster
   (Chem.) An element, atom, or radical having a valence or combining power of two.
   1913 Webster
         
       

2.       
   Dyad, a. (Chem.) 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.
   1913 Webster