[twin] n [ME, fr. twin twofold] (14c) 1 a: either of two offspring produced at a birth b pl, cap: gemini
2: one of two persons or things closely related to or resembling each other
3: a compound crystal composed of two adjoining crystals or parts of crystals of the same kind that share a common plane of atoms -- twin.ship n
[2]twin vb twinned ; twin.ning vt (14c) 1: to bring together in close association: couple
2: duplicate, match ~ vi 1: to bring forth twins
2: to grow as a twin crystal [3]twin adj [ME, twofold, double, fr. OE twinn; akin to ON tvinnr two by two, OE twa two] (1590) 1: born with one other or as a pair at one birth "~ brother" "~ girls"
2. a: made up of two similar, related, or connected members or parts: double b: paired in a close or necessary relationship: matching c: having or consisting of two identical units d: being one of a pair