from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Situated in front of the operculum.
  • adj. Relating to the preoperculum.
  • n. The preoperculum.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Situated in front of the operculum; pertaining to the preoperculum.

from The Century Dictionary and Cyclopedia

  • In ichthyology, pertaining to or connected with the præoperculum. See opercular.
  • n. Same as præoperculum, 2.
  • n. The anterior end of the lancelet, which projects beyond the mouth, or oral opening.


pre- +‎ opercular (Wiktionary)


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