dexter

Etymology

Learned borrowing from Latin dexter (“right”).

adj

1. (archaic outside heraldry) Right; on the right-hand side. (In heraldry, specifically the bearer's right, which is the viewer's left.)
   Displaying his dexter palm, he exclaimed that there was a hand that never took a bribe; whereupon a smart auditor cried "How about the one behind your back?" 1887, George William Foote, J. M. Wheeler, Crimes of Christianity, London: Progressive Publishing
   Clovis wiped the trace of Turkish coffee and the beginnings of a smile from his lips, and slowly lowered his dexter eyelid. 1911, Saki, ‘The Match-Maker’, The Chronicles of Clovis
   […] the dexter lion being gorged […] 1998-07-06, Auguste Vachon, Claire Boudreau, Daniel Cogné, Genealogica & Heraldica: Ottawa 1996, University of Ottawa Press, page 324

noun

1. (archaic outside heraldry) The right side (of a building, an equation, a heraldic shield [from the wearer's perspective], etc).
   Subtracting the second from the first, the third from the second and the first from the third successively, we obtain, after transposition, the following identities: — [several equations] But, the sinisters being exact differentials, the dexters are so. Consequently … 1879, London Mathematical Society, Proceedings of the London Mathematical Society, page 112
   On the dexter of the court is a long hall with an arched ceiling and a door, leading to a small oblong shrine with a vaulted ceiling. 1971, Debala Mitra, Buddhist Monuments