ctenidium comb-like respiratory structure serving as the gill of certain mollusks
ceras one of the often brightly colored and branching hornlike structures on the back of the nudibranch (and other related mollusks) that serve as gills
gill -
a United States liquid unit equal to 4 fluid ounces
A gill is a respiratory organ found in many aquatic organisms that extracts dissolved oxygen from water, afterward excreting carbon dioxide. (It does not break up water molecules into hydrogen and oxygen to absorb oxygen. ) The gills of some species such as hermit crabs have adapted to allow respiration on land provided they are kept moist.
OmegaWiki Dictionary
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gill The breathing organ of fish and other aquatic animals.
