sesqui-

sesqui-

a combining form meaning “one and a half,” used in the formation of compound words: sesquicentennial.

Origin:
< Latin sēsqui- < *sēm(i)sque, equivalent to sēmis half-unit, semis + -que and (cognate with Greek té, Sanskrit ca, Gothic -uh)

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sesqui-
 
prefix
1.  indicating one and a half: sesquicentennial
2.  (in a chemical compound) indicating a ratio of two to three: sesquioxide
 
[from Latin, contraction of semi- + asas² + -que and]

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