- one and a half: sesquicentennial
- Chem. containing two atoms of one radical or element combined with three of another: sesquicarbonate
Origin of sesqui-L, more by a half from semis, half ( from semi-: see semi-) + -que, and from Indo-European an unverified form kwe (enclitic) from source Sanskrit ca, Classical Greek te, Old Irish -ch, Gothic -h
One and a half: sesquicentennial.
Origin of sesqui-Latin sēsqui- sēmis a half ; see sēmi- in Indo-European roots. -que and ; see kwe in Indo-European roots.