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Anal fin

the median, unpaired fin on the ventral margin between the anus and the caudal fin in fishes.
Historical Examples

anal fin resembling the second dorsal, greyish, with the margin dull-purple.
Zoological Illustrations, Volume I William Swainson

a median ventral unpaired fin, situated between the anus and the tail fin in fishes, that helps to maintain stable equilibrium


Read Also:

  • Anal fissure

    anal fissure anal fissure n. A crack or slit in the mucous membrane of the anus.

  • Anal fistula

    anal fistula anal fistula n. A fistula opening at or near the anus, usually into the rectum above the internal sphincter.

  • Anal orifice

    anal orifice anal orifice n. See anus.

  • Anal intercourse

    noun a form of sexual intercourse in which the penis is inserted into the anus

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