[sesqui-] comb form [L, one and a half, half again, lit., and a half, fr. semis half of an as, one half (prob. fr. semi- + as as) + -que (enclitic) and; akin to Gk te and, Skt ca, Goth -h, -uh] 1: one and a half times "sesquicentennial"
2: containing half again as many atoms "sesquiterpene"
3: intermediate: combination "sesquicarbonate"