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

< Latin sēsqui- < *sēm(i)sque, equivalent to sēmis half-unit, semis + -que and (cognate with Greek té, Sanskrit ca, Gothic -uh) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
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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