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a combining form meaning “wedge,” used in the formation of compound words:
Also, especially before a vowel, sphen-.
Origin of spheno-
< New Latin < Greek sphḗn wedge + -o- -o- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for spheno-


combining form
having the shape of a wedge: sphenogram
Word Origin
from Greek sphēn wedge
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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Word Origin and History for spheno-

word-forming element meaning "wedge," from comb. form of Greek sphen "wedge," probably cognate with Old Norse spann "splinter," Old English spon "chip of wood" (see spoon (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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spheno- in Medicine

spheno- or sphen-
Wedge; wedge-shaped: sphenocephaly.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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