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Medical Definition of Fish-mouth meatus
1. A red and swollen condition of the orifice of the urethra (urinary meatus) in gonorrhoea. Internal acoustic meatus, a canal running from the opening of the internal acoustic meatus, through the petrous portion of the temporal bone, ending at the fundus where a thin plate of bone separates it from the vestibule; it gives passage to the facial and vestibulocochlear nerves together with the labyrinthine artery and veins. Synonym: meatus acusticus internus, internal auditory meatus. (05 Mar 2000)