Function: combining form
Etymology: Latin, one and a half, half again, literally, and a half, from semis half of an as, one half (prob. from semi- + as as) + -que (enclitic) and; akin to Greek te and, Sanskrit circa, Gothic -h, -uh
1 : one and a half times < sesqui centennial>
2 : containing half again as many atoms < sesqui terpene>
3 : intermediate : combination < sesqui carbonate>