a combining form meaning “seven,” used in the formation of compound words: heptahedron.
Also, especially before a vowel, hept-.

< Greek, combining form of heptá seven; cognate with Latin septem; akin to Old English seofon seven

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World English Dictionary
hepta- or (before a vowel) hept-
combining form
seven: heptameter
[from Greek]
hept- or (before a vowel) hept-
combining form
[from Greek]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hepta- or hept-

  1. Seven: heptameter.

  2. Containing seven atoms, molecules, or groups: heptane.

The American Heritage® Stedman's Medical Dictionary
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