Bible Dictionaries
Twinning

Webster's Dictionary

(1):

(p. pr. & vb. n.) of Twin

(2):

(n.) 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.

Bibliography Information
Webster, Noah. Entry for 'Twinning'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/twinning.html. 1828.