Definition of vertical fin in English:

vertical fin

Syllabification: ver·ti·cal fin

noun

Zoology
  • Any of the unpaired fins in the midline of a fish’s body, i.e., a dorsal, anal, or caudal fin.
    More example sentences
    • But the first thing he saw as he surfaced was not a dolphin but the vertical fin of a great white.
    • At hatching the larvae are quite advanced with pigmented eyes, well-developed jaws, digestive tracts, and vertical fin folds.

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Word of the day milord
Pronunciation: mɪˈlɔːd
noun
used to address an English nobleman