a combining form meaning “wedge,” used in the formation of compound words: sphenography.
Also, especially before a vowel, sphen-.

< Neo-Latin < Greek sphḗn wedge + -o- -o-

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World English Dictionary
spheno- or (before a vowel) sphen-
combining form
having the shape of a wedge: sphenogram
[from Greek sphēn wedge]
sphen- or (before a vowel) sphen-
combining form
[from Greek sphēn wedge]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

comb. form meaning "wedge," from Gk. sphen "wedge," probably cognate with O.N. spann "splinter," O.E. spon "chip of wood" (see spoon).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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