sexvirateA group of six men, especially (politics) a council of six men who share office or rule, particularly (historical) various such councils in ancient Rome.
sexy primeEither of a pair of prime numbers that differ by six.
SicelA member of an Italic tribe who inhabited eastern Sicily during the Iron Age.
sicilicusA diacritic, resembling a 180°-rotated ‘C’ (i.e., being similar in appearance to ⟨ᵓ⟩), written atop a consonant to mark gemination, superseded in Classical Latin by doubling the letter representing the geminated consonant.
sic semper tyrannisThus always to tyrants; tyrannical leaders will inevitably be overthrown.
significateOne of several things signified by a common term.
significatorysignificant; meaningful; having signification
sign of the crossA gesture of the hand moving over the front of one's body, or over an object, in the shape of a cross made as part of ritual or to invoke divine protection.
silvicsThe study of the characteristics of trees, including especially their role in the ecology of their forest habitats; such information collected about individual trees and tree species.
sinamineAllyl cyanamide derived from oil of mustard.
sinapineAn alkaloidal amine found in seeds of black mustard (Brassica nigra, syns. Rhamphospermum nigrum, Sinapis erysimoides, Sinapis tetraedra, etc.), considered a choline ester of sinapic acid.
sinapinicOf or pertaining to sinapinic acid or its derivatives
sinapisinA substance extracted from mustard seed, probably identical with sinalbin.
sinuateTo advance in wavy or curvy manner, to bend, to curve, to wind in and out
siphuncleA strand of tissue passing longitudinally through the shell of a cephalopod, used primarily in emptying water from new chambers as the shell grows.
siphunculeA tube that connects adjacent chambers in the shells of some cephalopods.
si quisA notification by a candidate for Holy Orders of his intention to enquire whether any impediment may be alleged against him.
Sixto-ClementineOf, pertaining to, or designating the edition or text of the Vulgate (1592, corrected in 1593 and 1598), correcting that of Pope Sixtus V (r. 1585–90), which was revised on the orders of Pope Clement VIII (r. 1592–1605).
SlaviThe Russian Orthodox Christmas, which is celebrated from January 6 through 13 in outstate Alaska, USA, wherever there is a sizable Russian Orthodox population.