Bible Dictionaries
Sesqui

Webster's Dictionary

A combining form (also used adjectively) denoting that three atoms or equivalents of the substance to the name of which it is prefixed are combined with two of some other element or radical; as, sesquibromide, sesquicarbonate, sesquichloride, sesquioxide.

Bibliography Information
Webster, Noah. Entry for 'Sesqui'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​s/sesqui.html. 1828.