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1. Of or relating to a method of establishing a new colony, found in certain social insects, in which a queen (in ants) or a queen and king pair (in termites) sequesters itself in a small chamber and hatches the first generation of workers, nourishing them primarily on stored body fat.
2. Of or relating to a claustrum, especially of the brain.
3. Variant of cloistral.
[Latin claustrum, bar, barrier, enclosed place; see cloister + -al.]
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.
(Ecclesiastical Terms) a less common variant of cloistral
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
[1400–50; late Middle English < Late Latin claustrālis=claustr(um) bolt, barrier (claud(ere) to close, shut + -trum instrumental suffix) + -ālis -al1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.