n (anatomy) The middle layer of the wall of a blood vessel or lymph vessel which is composed of connective and muscular tissue.
n (often|used as|_|uncountable|though such use is|_|proscribed) means | Means and institutions for publishing and broadcasting information.
n (usually|with a definite article; often used as|_|uncountable|though such use is|_|proscribed) The journalists and other professionals who comprise the mass communication industry.