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masthead the top of a ship's mast. [2 definitions]
mastic an aromatic gum or resin from the bark of a small evergreen tree of the Mediterranean region, used as an astringent and an ingredient in varnish. [3 definitions]
masticate to grind (food) with the teeth; chew. [2 definitions]
masticatory of, relating to, or used in mastication; adapted for chewing. [2 definitions]
mastiff one of a breed of large, strong dogs that have a short, light brown coat and are often used as watchdogs.
mastitis an inflammation of the breast or udder.
masto- breast.
mastodon any of a number of extinct mammals of about two million years ago that were large and resembled the elephant.
mastoid of or pertaining to the lower portion of the bone behind the ear in humans and other vertebrates. [3 definitions]
mastoiditis inflammation of the air cells in the mastoid bone at the base of the skull.
mastoid process the posterior part of the temporal bone that is located behind the inner ear, having attachment points for muscle and openings for the passage of blood vessels.
masturbate to excite one's own genitals to reach orgasm. [2 definitions]
masturbation the excitation of one's own or another's genital organs to cause orgasm, esp. by manual stimulation.
mat1 a piece of material, esp. a strong carpet fabric such as wool, that is used as a covering to protect a floor or other surface. [7 definitions]
mat2 a piece of cardboard or other stiff material that acts as a frame for a picture or as a border between a picture and its frame. [2 definitions]
mat3 variant of matte.
matador the person who fights and attempts to kill the bull with a sword in a bullfight.
match1 a slender strip of wood or cardboard with a combustible material on the end that is ignited by friction.
match2 a person or thing that is identical to or like another. [11 definitions]
matchbook a small, usu. cardboard folder containing rows of matches.
matchbox a small cardboard box that holds matches.