macho

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Characterized or motivated by machismo.
• noun Machismo.
• noun A person characterized by or exhibiting machismo.

from The Century Dictionary.

• noun A fish, Mugil carema, of the mullet family.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Manly, especially with an assertive and domineering manner toward women.
• noun (Zoöl.) The striped mullet of California (Mugil cephalus, syn. Mugil Mexicanus).
• noun A form of dark matter in distant outer space unobservable except by its gravitational effect, and believed to be at least part of the “missing matter” which is unobservable as ordinary stars, but helps keep galaxies from flying apart; MACHOS are massive but compact objects such as neutron stars or brown dwarfs, which can be detected (with difficulty) by their effect in bending light from distant light sources, such as other galaxies. This can occur if by rare chance a MACHO passes in front of a more distant visible object, and the light from that object becomes temporarily amplified by the MACHO acting as a gravitational lens. Some MACHOs have been discovered in the halo of dark matter that surrounds our milky way. It is, however, questionable whether the amount of such matter is sufficient to explain the ability of galaxies to stay together in spite of rotation rates that would cause them to fly apart if the only matter present was that observable as visible stars.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective informal tending to display manly characteristics, such as domineering, fierceness, bravado, etc., in ways that are showily and histrionically tough
• noun A macho person; a person who tends to display manly characteristics, such as domineering, fierceness, and bravado.
• noun The striped mullet of California (Mugil cephalus, / Mexicanus).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a male exhibiting or characterized by machismo
• adjective used of men; markedly masculine in appearance or manner