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Related to sesqui-: Hepta
Prefix denoting 3/2; at one time used in chemistry to indicate a ratio of 3:2 between the two parts of a compound (for example, sesquisulfide, sesquibasic), but presently used only for sesquihydrates and sesquiterpenes.
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sesqui-[L. sesqui-, one and a half]
Prefix meaning one and a half.
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