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The Collaborative International Dictionary of English v.0.48 (gcide)

Twin \Twin\, v. i.
To depart from a place or thing. [Obs.] "Ere that we farther
twin." --Chaucer.
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Twin \Twin\, v. i. [imp. & p. p. {Twinned}; p. pr. & vb. n.
{Twinning}.]
1. To bring forth twins. --Tusser.
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2. To be born at the same birth. --Shak.
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Twin \Twin\, v. t.
1. To cause to be twins, or like twins in any way. --Shak.
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Still we moved
Together, twinned, as horse's ear and eye.
--Tennyson.
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2. To separate into two parts; to part; to divide; hence, to
remove; also, to strip; to rob. [Obs.]
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The life out of her body for to twin. --Chaucer.
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Twin \Twin\, n.
1. One of two produced at a birth, especially by an animal
that ordinarily brings forth but one at a birth; -- used
chiefly in the plural, and applied to the young of beasts
as well as to human young.
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2. pl. (Astron.) A sign and constellation of the zodiac;
Gemini. See {Gemini}.
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3. A person or thing that closely resembles another.
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4. (Crystallog.) A compound crystal composed of two or more
crystals, or parts of crystals, in reversed position with
reference to each other.
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Note: The relative position of the parts of a twin may be
explained by supposing one part to be revolved 180[deg]
about a certain axis (called the twinning axis), this
axis being normal to a plane (called the twinning
plane) which is usually one of the fundamental planes
of the crystal. This revolution brings the two parts
into parallel position, or vice versa. A contact twin
is one in which the parts are united by a plane
surface, called the composition face, which is usually
the same as the twinning plane. A penetration twin is
one in which the parts interpenetrate each other, often
very irregularly. Twins are also called, according to
form, cruciform, geniculated, etc.
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Twin \Twin\ (tw[i^]n), 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.
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2. Being one of a pair much resembling one another; standing
in the relation of a twin to something else; -- often
followed by to or with. --Shak.
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3. (Bot.) Double; consisting of two similar and corresponding
parts.
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4. (Crystallog.) Composed of parts united according to some
definite law of twinning. See {Twin}, n., 4.
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{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 ({Linnaea
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.
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