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reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for example by pressure), the process by which this reversal is brought about. Polysynthetic twinning, repeated twinning of crystal lamellæ, as that of the triclinic feldspars. -- Repeated twinning, twinnin…

The act of twinning, or the state of being intwined.

Imitative; characterized by resemblance to other forms; -- applied to crystals which by twinning resemble simple forms of a higher grade of symmetry.

n in a crystallized mineral, due to some other cause than cleavage, as to the presence of twinning lamellæ.

Characterized by polysynthesis; agglutinative. Polysynthetic twinning (Min.), repeated twinning, like that of the triclinic feldspar, producing fine parallel bands in alternately reversed positions.

A kind of symmetry characteristic of certain crystals which from twinning, or other causes, come to resemble forms of a system other than that to which they belong, as the apparently hexagonal prisms of aragonite.

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 (Linnæa borealis) of northern climates, which has p…

und something; twisting; embracing; climbing by winding about a support; as, the hop is a twinning plant.

Composed of parts united according to a law of twinning. See Twin, n., 4.