twin
1. twin \'twin\ aj [ME, fr. OE twinn twofold, two by two; akin to ON tvinnr
two by two], OE twa- two 1: born with one other or as a pair at one birth
{~ brother} { ~ girls} 2a: made up of two similar, related, or connected
members or parts : DOUBLE 2b: paired in a close or necessary relationship
: MATCHING 2c: having or consisting of two identical units 2d: being one
of a pair {~ city}
2. twin n 1: either of two offspring produced at a birth 2: one of two
persons or things closely related to or resembling each other 3: a
compound crystal composed of two or more crystals or parts of crystals of
the same kind that are grown together in a specific rational manner
3. twin vb or twinned; or twin.ning 1: to bring together in close
association : COUPLE 2: DUPLICATE, MATCH 1: to bring forth twins 2: to
grow as a twin crystal