Meatus

In anatomy, a meatus (,, : meatus or meatuses) 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.)