epitheca

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It's a recognised English word, but it isn't in the official NASPA Scrabble word list.

Definition of epitheca

1 sense · 1 part of speech · etymology included

noun

The upper half of the theca of a thecate protist such as a diatom or dinoflagellate.

“Cellariiform, the orifices nearly confined to the convex frontal and lateral surfaces; the basal surface with a strong median calcareous keel, almost concealed by a flat membranous epitheca, which covers the whole zoarium […]”

Definitions from Wiktionary, CC BY-SA.

Ancient Greek ἐπί (epí, “upon”) + θήκη (thḗkē, “case, box, receptacle”)

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139 playable · top: PETECHIA (15 pts)

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