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There are 12 words ending with THECA

THECA	• theca n. (Biology) Any external case or sheath. • theca n. (Botany) The pollen-producing organ usually found in pairs and forming an anther. • theca n. (Medicine) The twin layers of cells surrounding the basal lamina of an ovarian follicle.
OOTHECA	• ootheca n. An egg case of any of the orthopteroid insects (such as cockroaches and mantids). • oötheca n. Alternative spelling of ootheca. • OOTHECA n. (Greek) the egg case of certain insects.
EPITHECA	• epitheca n. (Microbiology, planktology) The upper half of the theca of a thecate protist such as a diatom or dinoflagellate. • EPITHECA n. the outer older cell layer of a diatom.
HYPOTHECA	• hypotheca n. (Microbiology, planktology) The lower or posterior half of the theca of a thecate protist such as a… • HYPOTHECA n. the inner and younger layer of the cell wall of a diatom.
HYDROTHECA	• hydrotheca n. (Zoology) One of the calicles that protect the hydranths in certain Hydroidea (Thecaphora). • HYDROTHECA n. the horny cup of a hydranth.
RHINOTHECA	• rhinotheca n. The hornlike covering of the upper part of a bird’s beak. • RHINOTHECA n. the sheath of the upper mandible of a bird.
BIBLIOTHECA	• bibliotheca n. (Obsolete) A library. • BIBLIOTHECA n. a collection of books; a list of books.
GLYPTOTHECA	• glyptotheca n. A room or building devoted to works of sculpture. • GLYPTOTHECA n. a place for keeping sculpture.
PINACOTHECA	• pinacotheca n. An art gallery (especially a picture gallery). • PINACOTHECA n. a picture-gallery.
SPERMATHECA	• spermatheca n. (Anatomy) A small sac within the reproductive tract of some female invertebrates, such as insects, which… • SPERMATHECA n. a receptacle for storing spermatozoa in insects.
RHAMPHOTHECA	• rhamphotheca n. A thin horny sheath of keratin on the outer surface of a bird’s beak. • RHAMPHOTHECA n. the horny or leathery outer layer of a bird's bill.
SPERMATOTHECA	• spermatotheca n. Synonym of spermatheca. • SPERMATOTHECA n. a receptacle for storing sperm.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

See this list for:

English Wiktionary: 32 words
Scrabble in French: no word
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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