Webster's 1913 Dictionary
TWINNING
TWINNING Twin "ning, n. (Crystallog.)
Defn: 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 lamellæ, 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.
New American Oxford Dictionary
twinning
twin ning |ˈtwiniNG ˈtwɪnɪŋ | ▶noun the bearing of twins: the study showed an increased level of twinning in cattle. • the occurrence or formation of twinned crystals.
Oxford Dictionary
twinning
twin |ning |twɪnɪŋ | ▶noun [ mass noun ] the bearing of twins: the study showed an increased level of twinning in cattle. • the occurrence or formation of twinned crystals.
Sanseido Wisdom Dictionary
twinning
twin ning /twɪ́nɪŋ /名詞 U 1 ｟英 ｠(外国の町 都市と )友好関係を結ぶこと ; その関係 .2 双子を産むこと ; (2つのものを )対にする [結び付ける ]こと .
The Wordsmith Dictionary