spheno-

or sphen-

pref.

Wedge; wedge-shaped: sphenodon.

[Greek sphēno-, from sphēn, wedge.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

spheno-

or before a vowel

sphen-

combining form

having the shape of a wedge: sphenogram.

[from Greek sphēn wedge]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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