Biology. resembling a lattice; divided or marked like latticework.
Chemistry. a substance in which a molecule of one compound fills a cavity within the crystal lattice of another compound.
Compare adduct.

1615–25; < Latin clāt(h)rātus, past participle of clāt(h)rāre to fit with bars, verbal derivative of clāt(h)ra bars, lattice < Greek, Doric equivalent of Attic klâithra, plural of klêithron bar; see clithral Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clathrate (ˈklæθreɪt)
1.  resembling a net or lattice
2.  chem a solid compound in which molecules of one substance are physically trapped in the crystal lattice of another
[C17: from Latin clāthrāre to provide with a lattice, from Greek klēthra, from klaithron a bar]

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American Heritage
Medical Dictionary

clathrate clath·rate (klāth'rāt')

  1. Having a latticelike structure or appearance.

  2. Of or relating to inclusion complexes in a chemical compound in which molecules of one substance are completely enclosed within the crystal structure of another.

A clathrate compound, such as urea.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Clean out the hole at the top that is getting clogged with methane clathrate.
The guest occupancy of the hollow space is calculated by the same method as applied to clathrate hydrates.
Controlled environment sample cell for in situ neutron scattering studies of clathrate hydrates.
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