tetrad


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tet·rad

 (tĕt′răd′)
n.
1. A group or set of four.
2. A tetravalent atom, radical, or element.
3. Biology
a. A four-part structure that forms during the prophase of meiosis and consists of two homologous chromosomes, each composed of two sister chromatids.
b. A group of four haploid cells, such as spores, formed by meiotic division of one mother cell.
[Greek tetras, tetrad-; see kwetwer- in Indo-European roots.]
te·trad′ic adj.
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.

tetrad

(ˈtɛtræd)
n
1. (Mathematics) a group or series of four
2. (Mathematics) the number four
3. (Biology) botany a group of four cells formed by meiosis from one diploid cell
4. (Genetics) genetics a four-stranded structure, formed during the pachytene stage of meiosis, consisting of paired homologous chromosomes that have each divided into two chromatids
5. (Chemistry) chem an element, atom, group, or ion with a valency of four
6. (Environmental Science) ecology a square of 2 × 2 km used in distribution mapping
[C17: from Greek tetras, from tettares four]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

tet•rad

(ˈtɛ træd)

n.
1. a group of four.
2. the number four.
3. Biol. a group of four chromatids formed by synapsis at the beginning of meiosis.
[1645–55; < Greek tetrad-, s. of tetrás group of four]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

Tetrad

 a group of four; four things regarded together as a single object or thought.
Example: Great Tetrad of senior wranglers, 1898.
Dictionary of Collective Nouns and Group Terms. Copyright 2008 The Gale Group, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tetrad - the cardinal number that is the sum of three and onetetrad - the cardinal number that is the sum of three and one
IV, Little Joe, quadruplet, quartet, quatern, 4, four, quaternion, quaternity, foursome, quaternary
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.
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tet·rad

n. tétrada, grupo de cuatro elementos similares.
English-Spanish Medical Dictionary © Farlex 2012
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