I. ˈlüə̇ˌsīt noun
( -s )
Etymology: William J. Lewis died 1926 English mineralogist + English -ite
: a mineral consisting of a titanian romeite related to pyrochlore
II. noun
( -s )
Etymology: Winford Lee Lewis died 1943 American chemist + English -ite
: a colorless to amber to dark brown liquid vesicant that sometimes has an odor like that of geraniums, that is made by reaction of acetylene with arsenic trichloride, and that was developed for use as a war gas but has never been so used; dichloro-2-chloro-vinyl-arsine