Sesqui- Definition

seskwi, seskwə, seskwē
prefix
One and a half.
Wiktionary

In a ratio of 3 to 2

Wiktionary
affix
One and a half.
Sesquicentennial.
Webster's New World
Containing two atoms of one radical or element combined with three of another.
Sesquicarbonate.
Webster's New World

Origin of Sesqui-

  • L, more by a half < semis, half (< semi-: see semi-) + -que, and < IE *kwe (enclitic) > Sans ca, Gr te, OIr -ch, Goth -h

    From Webster's New World College Dictionary, 5th Edition

  • Latin sēsqui- sēmis a half sēmi- in Indo-European roots -que and kwe in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin sēsqui

    From Wiktionary

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