hepta-


Also found in: Medical, Wikipedia.
Related to hepta-: octo-, penta-

hepta-

(word root) seven
Examples of words with the root hepta-: heptagon
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree

hepta-

or hept-
pref.
Seven: heptarchy.

[Greek, from hepta, seven; see septm̥ in Indo-European roots.]
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.

hepta-

or before a vowel

hept-

combining form
seven: heptameter.
[from Greek]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

hepta-

a combining form meaning “seven”: heptamerous.
Also, esp. before a vowel,hept-.
[< Greek, comb. form of heptá seven, c. Latin septem; akin to Old English seofon seven]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
In Model 2, neither the omnibus test nor the 4th to 1st quartiles shows significant differences for the penta- and hexachloro congeners, while for the most highly chlorinated congeners (hepta- octa-, nona- and decachlorobiphenyls) there was a significant omnibus difference among the four quartiles (p = 0.0071) as well as a significant negative difference between the 1st and 2nd quartiles [OR = 0.33 (95% CI: 0.11, 0.96)].
Though they found trace residues in the edible portion of fish from certain regions in the Great Lakes and elsewhere, they said, "the presence of 2,3,7,8-TCDD in fish does not appear to be widespread, but rather is localized in areas near 2,4,5-TCP and 2,4,5-T production sites." FDA analyses since 1979 for more highly chlorinated dioxins have turned up hepta- and octa-chlorinated species in eggs, bacon, chicken, pork chops and beef liver--contamination that the researchers say appears to be related to agricultural use of pentachlorophenol.
Apparent half-lives of hepta- to deca-brominated diphenyl ethers in human serum as determined in occupationally exposed workers.