| twinleaf | <botany> See Jeffersonia. Source: Websters Dictionary (01 Mar 1998) |
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| twinned | <chemistry> Composed of parts united according to a law of twinning. See Twin. Source: Websters Dictionary (01 Mar 1998) |
| twinning | <chemistry> The assemblage of two or more crystals, or parts of crystals, in reversed position with 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 lamellae, as that of the triclinic feldspars. Repeated twinning, twinning of more than two crystals, or parts of crystals. Twinning axis, Twinning plane. See the Note under Twin. Source: Websters Dictionary (01 Mar 1998) |
| twins, dizygotic | Two offspring produced in the same pregnancy from separate ova fertilised at the same time. (12 Dec 1998) |
| twins, monozygotic | Two offspring developed from one fertilised ovum. (12 Dec 1998) |