Look up meatus in Wiktionary, the free dictionary.

In anatomy, a meatus (/miːˈeɪtəs/, mee-AY-təs,^[1] pl.: meatus or meatuses)^[2] is a natural body opening or canal.

Meatus may refer to:

• the external acoustic meatus, the opening of the ear canal
• the internal auditory meatus, a canal in the temporal bone of the skull
• the urinary meatus, which is the opening of the urethra, situated on the glans penis in males and in the vulval vestibule in females
• one of three nasal meatuses: the superior meatus, middle meatus and inferior meatus; each are passages through the nasal cavity within the skull

(The plural forms of "meatus" are: meatus, as a Latin form (of the fourth declension noun class, which the word belongs to); or meatuses, as a normally derived English plural; or often, and incorrectly, meati, by false analogy with the very common Latin -us/-i forms (such as alumnus/alumni), i.e., the second declension noun class.)