Meatus

In anatomy, a meatus is a natural body opening or canal (Latin, 4th declension pl. meatus, or meatuses - often incorrectly meati).

Examples include:
 * 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 vulva in females
 * the superior meatus, middle meatus and inferior meatus of the nose