Meaning of sesqui- in English:

sesqui-

Pronunciation /ˈsɛskwi/

  • 1Denoting one and a half.

    • ‘sesquicentenary’
    1. 1.1Chemistry (of a compound) in which a particular element or group is present in a ratio of 3:2 compared with another.
      • ‘sesquioxide’

Origin

From Latin semi- (see semi-) + que ‘and’.