'Twinning' definitions:

Definition of 'twinning'

From: WordNet
adjective
Producing two offspring at a time [syn: biparous, twinning]

Definition of 'Twinning'

From: GCIDE
  • Twin \Twin\, v. i. [imp. & p. p. Twinned; p. pr. & vb. n. Twinning.]
  • 1. To bring forth twins. --Tusser. [1913 Webster]
  • 2. To be born at the same birth. --Shak. [1913 Webster]

Definition of 'Twinning'

From: GCIDE
  • Twinning \Twin"ning\, n. (Crystallog.) 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. [1913 Webster]
  • 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, n. [1913 Webster]