heptad

hep·tad

 (hĕp′tăd′)

n.

A group or series of seven.

---

[Greek heptas, heptad-, the number seven, 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.

heptad

(ˈhɛptæd)

n

1. (Mathematics) a group or series of seven

2. (Mathematics) the number or sum of seven

3. (Chemistry) an atom or element with a valency of seven

[C17: from Greek heptas seven]

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

hep•tad

(ˈhɛp tæd)

n.

1. the number seven.

2. a group of seven.

[1650–60; < Greek heptad-, s. of heptás. See hepta-, -ad¹]

Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

Thesaurus

Noun

1.

heptad - the cardinal number that is the sum of six and one 7, septenary, septet, seven, sevener, VII digit, figure - one of the elements that collectively form a system of numeration; "0 and 1 are digits"

Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.