Tip: Spørgsmålstegn (?) kan anvendes som jokertegn (wild card). Spørgsmålstegnet erstatter præcis et tegn.
Engelsk navneord: operculum
1.
operculum(om dyr)a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted