Usually means: Protective case for plant spores.
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We found 32 dictionaries that define the word theca:

General (20 matching dictionaries)
  1. theca: Merriam-Webster.com
  2. theca: Oxford Learner's Dictionaries
  3. theca: American Heritage Dictionary of the English Language
  4. theca: Collins English Dictionary
  5. theca: Vocabulary.com
  6. theca: Wordnik
  7. theca: Wiktionary
  8. theca: Webster's New World College Dictionary, 4th Ed.
  9. theca: The Wordsmyth English Dictionary-Thesaurus
  10. theca: Infoplease Dictionary
  11. theca: Dictionary.com
  12. Theca: Wikipedia, the Free Encyclopedia
  13. Theca: Online Plain Text English Dictionary
  14. theca: Webster's Revised Unabridged, 1913 Edition
  15. theca: Rhymezone
  16. Theca: AllWords.com Multi-Lingual Dictionary
  17. theca: Free Dictionary
  18. theca: The Phrontistery - A Dictionary of Obscure Words
  19. theca: Mnemonic Dictionary
  20. theca: Dictionary/thesaurus

Art (1 matching dictionary)
  1. -theca, theca-: A Cross Reference of Latin and Greek Elements

Computing (1 matching dictionary)
  1. theca: Encyclopedia

Medicine (5 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. online medical dictionary (No longer online)
  3. Probert Encyclopaedia of Medicine (No longer online)
  4. Neurotrauma Glossary (No longer online)
  5. theca: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. THECA: Acronym Finder

Science (4 matching dictionaries)
  1. Botanical Terms (No longer online)
  2. Tree of Life Glossary (No longer online)
  3. Bryological (No longer online)
  4. theca: Natural History Terms

(Note: See thecae as well.)

Definitions from Wiktionary (theca)

noun:  (biology) Any of several external cases or sheaths.
noun:  (biology, botany) The pollen-producing organ usually found in pairs and forming an anther.
noun:  (biology, medicine) The theca folliculi: the twin layers of cells surrounding the basal lamina of an ovarian follicle.
noun:  (biology, medicine) The thecal sac: the portion of the dura mater that surrounds the spinal cord and the cauda equina.
noun:  (biology, microbiology, planktology) The membrane complex enveloping the cells of certain plankton including diatoms and dinoflagellates.
noun:  (biology, marine biology) The calcareous wall of a corallite, the exoskeleton of a coral polyp.
noun:  (biology, microbiology, mycology) A sporangium: a spore case.
noun:  (Christianity) A case for the corporal cloth used in the Eucharist.

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