- opercular opening
-
gill opening
Dictionary of ichthyology. 2009.
opercular opening
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operculum — opercular, adj. /oh perr kyeuh leuhm/, n., pl. opercula / leuh/, operculums. 1. Bot., Zool. a part or organ serving as a lid or cover, as a covering flap on a seed vessel. 2. Zool. a. the gill cover of fishes and amphibians. See diag. under fish … Universalium
fish — fishless, adj. /fish/, n., pl. (esp. collectively) fish, (esp. referring to two or more kinds or species) fishes, v. n. 1. any of various cold blooded, aquatic vertebrates, having gills, commonly fins, and typically an elongated body covered with … Universalium
Fish — /fish/, n. Hamilton, 1808 93, U.S. statesman: secretary of state 1869 77. * * * I Any of more than 24,000 species of cold blooded vertebrates found worldwide in fresh and salt water. Living species range from the primitive lampreys and hagfishes… … Universalium
part — A portion. SYN: pars [TA]. abdominal p. of aorta SYN: abdominal aorta. abdominal p. of esophagus [TA] the portion of the esophagus from where it passes through the diaphragm to the stomach. See … Medical dictionary
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