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Definition of "theca" [the•ca]

  • A case, covering, or sheath, such as the pollen sac of an anther, the spore case of a moss, or the outer covering of the pupa of certain insects. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "theca" in a sentence
  • "Fully formed ovarian follicle: • Outside the theca interna some fibrous tissue becomes condensed to form another covering for the follicle called the theca externa."
  • "Last year we found and bought a second hand relic, some fabric from the blanket which St Therese used set in a silver theca itself set in a monstrance style stand."
  • "Bibliographies of alchemical texts date from an early period, but the two standard lists are J. Ferguson, Biblio - theca Chemica, 2 vols."