a combining form meaning “seven,” used in the formation of compound words: septilateral. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
septi- or (before a vowel) sept-1
combining form
seven: septivalent
[from Latin septem]
sept- or (before a vowel) sept-1
combining form
[from Latin septem]

combining form
septum: septicidal

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

septi- pref.

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