meatus
[me-a´tus] (pl. mea´tus) (L.) an
opening or passage, especially one leading to the body surface. adj.,
adj mea´tal.
acoustic meatus (
meatus acus´ticus) either of two passages in the ear; the
external acoustic meatus leads from the
auricle to the
tympanic membrane (eardrum) and the
internal acoustic meatus is for passage of nerves and blood vessels.
meatus na´si (meatus of nose) one of the three portions of the nasal cavity on either side of the septum: inferior (meatus nasi inferior), middle (meatus nasi medius), and superior (meatus nasi superior).
meatus urina´rius (
urinary meatus) the opening of the
urethra on the body surface, through which urine is discharged.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.