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Webster’s Dictionary (1828)

98,828 entries. Headwords are matched first, then definition text.

5 words match “DYAD”

DYAD a. 3 definitions
ted for, combined with, or replaced by, two atoms of hydrogen; as, oxygen and calcium are dyad elements. See Valence.
DYADIC a.
Pertaining to the number two; of two parts or elements. Dyadic arithmetic, the same as binary arithmetic.
BIVALENT a.
Equivalent in combining or displacing power to two atoms of hydrogen; dyad.
U n.
our. Etymologically U is most closely related to o, y (vowel), w, and v; as in two, duet, dyad, twice; top, tuft; sop, sup; auspice, aviary. See V, also O and Y. See Guide to Pronunciation, §§ 130-144.
VALENCE n.
nad, and has a valence of one; the atoms of oxygen, nitrogen, and carbon are respectively dyads, triads, and tetrads, and have a valence respectively of two, three, and four.