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sesqui-

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

<Latin sēsqui-<*sēm(i)sque, equivalent to sēmis half-unit, semis + -que and (cognate with Greek té,Sanskrit ca,Gothic -uh)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use sesqui- in a sentence

  • At length it was discovered that sesqui-sulphide of phosphorus would make just as good matches and was harmless.

    Makers of Many Things|Eva March Tappan
  • We may, for example, differentiate in this way the alkaline bicarbonates from the sesqui-carbonates or the carbonates.

    The Mechanism of Life|Stphane Leduc
  • Float the paper on a solution of the sesqui-chloride of iron.

  • Sesqui-, Latin for one and a half; so Sesquipedalis, a foot and a half long.

British Dictionary definitions for sesqui-

sesqui-

prefix
indicating one and a halfsesquicentennial
(in a chemical compound) indicating a ratio of two to threesesquioxide

Word Origin for sesqui-

from Latin, contraction of semi- + as as ² + -que and
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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