What is "quadri-"

Quadri- \Quad"ri-\ [L., from quattuor four. See Four.] A combining form meaning four, four times, fourfold; as, quadricapsular, having four capsules.

before vowels quad- (before -p- often quadru-, from an older form in Latin), word-forming element meaning "four, four times, having four, consisting of four," from Latin quadri-, related to quattor "four" (see four).

pre. four.