dy

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 ]

n. [ L. dyas, dyadis, the number two. Gr. &unr_;: cf. F. dyade. See two, and cf. Duad. ] 1. Two units treated as one; a couple; a pair. [ 1913 Webster ]

2. (Chem.) An element, atom, or radical having a valence or combining power of two. [ 1913 Webster ]

a. [ Gr. &unr_;, fr. &unr_; two. ] Pertaining to the number two; of two parts or elements. [ 1913 Webster ]

Dyadic arithmetic, the same as binary arithmetic. [ 1913 Webster ]

n. pl.; sing. Dyak. (Ethnol.) The aboriginal and most numerous inhabitants of Borneo. They are partially civilized, but retain many barbarous practices. [ 1913 Webster ]

‖n. [ L. dyas the number two. ] (Geol.) A name applied in Germany to the Permian formation, there consisting of two principal groups. [ 1913 Webster ]

prop. n. (Hinduism) the Hindu god of the sky.
Syn. -- Dyaus-pitar. [ WordNet 1.5 ]

prop. n. (Hinduism) the Hindu god of the sky; same as Dyaus.
Syn. -- Dyaus. [ WordNet 1.5 ]

n.; pl. dybbuks; Hebr. dybbukim (Jewish folklore) the wandering soul of a dead person, or a demon, that enters the body of a living person and controls that body's behavior. It may be exorcised by religious rites.
Syn. -- dibbuk. [ WordNet 1.5 +PJC ]