from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The lower or posterior half of the theca of a thecate protist such as a diatom or dinoflagellate

from the GNU version of the Collaborative International Dictionary of English

  • n. An obligation by which property of a debtor was made over to his creditor in security of his debt.

from The Century Dictionary and Cyclopedia

  • n. The inner half of the frustule of a diatom.


hypo- +‎ theca (Wiktionary)


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