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)