| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| dyad |
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| SYLLABICATION: | dy·ad |
| PRONUNCIATION: |  d   d , - d |
| NOUN: | 1. Two individuals or units regarded as a pair: the mother-daughter dyad. 2. Biology One pair of homologous chromosomes resulting from the division of a tetrad during meiosis. 3. Chemistry A divalent atom or radical. 4. Mathematics a. A function that draws a correspondence from any vector u to the vector (v·u)w and is denoted vw, where v and w are a fixed pair of vectors and v·u is the scalar product of v and u. For example, if v = (2,3,1), w = (0,-1,4), and u = (a,b,c), then the dyad vw draws a correspondence from u to (2a + 3b + c)w. b. A tensor formed from a vector in a vector space and a linear functional on that vector space. | | ADJECTIVE: | Made up of two units. | | ETYMOLOGY: | From Greek duas, duad-, from duo, two. See dwo- in Appendix I.
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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