Definition of sesqui- in English:

sesqui-

Syllabification: sesqui-

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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Pronunciation: inˌaməˈrätə
noun
a person's female lover