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molecule the smallest unit of a substance that has all the properties of that substance. A molecule is made up of a single atom or group of atoms.
mollusk an animal in a large group of invertebrates or animals without backbones. Most kinds of mollusks live in the ocean and have soft bodies covered by a shell. Snails, clams, squid, and octopuses are examples of mollusks.
molt to shed or cast off skin, feathers, fur, or horns, and grow a new covering.
molten made liquid by very high heat.
mom (informal) mother.
moment a very short amount of time. [2 definitions]
momentary lasting only a moment.
momentous very important.
momentum strength of movement.
Mon. an abbreviation for Monday.
Monaco a tiny Mediterranean country almost completely surrounded by France. The capital of Monaco is also called Monaco.
monarch a ruler such as a king, queen, or emperor. [2 definitions]
monarchy a nation or government ruled by or in the name of a king or queen. A monarch's power is either limited by a constitution or unlimited.
monastery a community of monks, or the buildings used by such a community.
Monday the second day of the week. Monday comes between Sunday and Tuesday.
monetary having to do with currency or money.
money the coins or paper notes of a country used to buy things or pay for services.
Mongol a person who was born in or is a citizen of Mongolia. [3 definitions]
Mongolia a country in eastern Asia. Mongolia is also called the Republic of Mongolia. Ulaanbaatar, also called Ulan Bator, is the capital of Mongolia. [2 definitions]
mongoose a mammal related to the ferret, known for its ability to kill poisonous snakes.
mongrel a plant or animal that is a mix of two or more breeds or kinds.