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deca-

1.
a combining form meaning “ten,” used in the formation of compound words:
decapod.
Also, especially before a vowel, dec-.
Compare deci-, deka
Origin
< Greek deka-, combining form of déka ten; cognate with Latin decem
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for deca

deca-

prefix
1.
denoting ten: decagon. In conjunction with scientific units the symbol da is used
Word Origin
from Greek deka
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 deca

deca-

before a vowel, dec-, word-forming element meaning "ten," from Latinized comb. form of Greek deka "ten" (see ten). In the metric system, "multiplied by ten;" while deci- means "divided by ten."

Online Etymology Dictionary, © 2010 Douglas Harper
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deca in Medicine

deca- or dec- or deka- or dek-
pref.
Ten: decane.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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deca in Science
deca-  
A prefix that means "ten," as in decahedron, a polygon having ten faces.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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