Twin \Twin\, a. [OE. twin double, AS. getwinne two and two, pl.,
twins; akin to D. tweeling a twin, G. zwilling, OHG.
zwiniling, Icel. tvennr, tvinnr, two and two, twin, and to
AS. twi- two. See Twice, Two.]
1. Being one of two born at a birth; as, a twin brother or
sister.
2. Being one of a pair much resembling one another; standing
the relation of a twin to something else; -- often
followed by to or with. --Shak.
3. (Bot.) Double; consisting of two similar and corresponding
parts.
4. (Crystallog.) Composed of parts united according to some
definite law of twinning. See Twin, n., 4.
Twin boat, or Twin ship (Naut.), a vessel whose deck and
upper works rest on two parallel hulls.
Twin crystal. See Twin, n., 4.
Twin flower (Bot.), a delicate evergreen plant (Linn[ae]a
borealis) of northern climates, which has pretty,
fragrant, pendulous flowers borne in pairs on a slender
stalk.
Twin-screw steamer, a steam vessel propelled by two screws,
one on either side of the plane of the keel.
Source: Webster's Revised Unabridged Dictionary (1913)
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