Definition of sesqui- in English:

sesqui-

Pronunciation: /ˈsɛskwi/

combining form

1Denoting one and a half: sesquicentenary
1.1 Chemistry (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'.

Definition of sesqui- in:

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the inversion of the usual order of words...