Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Of or pertaining to the hypotheca, the lower half of the shell of certain types of plankton

from The Century Dictionary and Cyclopedia

  • Situated beneath or within the test, as the radial water-tubes of echinoids. Compare epithecal, 2.
  • Of or pertaining to the hypotheca of a diatom.

Etymologies

hypotheca +‎ -al (Wiktionary)

Examples

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