sesqui- Hear it!

sesqui- Definition

sesqui- (ses′kwi, -kwə, -kwē)

  1. one and a half sesquicentennial
  2. Chem. containing two atoms of one radical or element combined with three of another sesquicarbonate

Etymology: L, more by a half < semis, half (< semi-: see semi-) + -que, and < IE *kwe (enclitic) > Sans ca, Gr te, OIr -ch, Goth -h