American Heritage® Dictionary of the English Language, Fourth Edition
- One and a half: sesquicentennial.
Century Dictionary and Cyclopedia
- n. A Latin prefix, meaning ‘One half more’—that is, an amount equal to one and a half times some unit, as in sesquitone; or an amount equal to a unit plus some part of itself, as in sesquialtera, sesquitertia, etc. In chem., it is used to designate compounds in which there are one and a half times as many atoms or radicals of one member of the compound as of the other: thus, sesquioxid of iron is an oxid containing two atoms of iron to three of oxygen.
- One and a half
- In a ratio of 3 to 2
GNU Webster's 1913
- (Chem.) A combining form (also used adjectively) denoting that
three atoms or equivalentsof the substance to the name of which it is prefixed are combined with twoof some other element or radical.
- From Latin sēsqui (Wiktionary)
- Latin sēsqui- : sēmis, a half; see sēmi- in Indo-European roots + -que, and; see kwe in Indo-European roots. (American Heritage® Dictionary of the English Language, Fourth Edition)
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