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Children's Dictionary
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microorganism any life form so small that it can only be seen with a microscope. Microorganisms include bacteria, viruses, and many protozoans.
microphone a device that changes sound waves into electronic signals. Microphones are used to make sounds louder or to broadcast or record them.
microscope an instrument that uses a lens to make very small objects larger so that they can be seen by the eye.
microscopic too small to be seen with the eye. [2 definitions]
microwave a type of radio wave with a high frequency. Microwaves are used in special ovens to heat food and liquids. [2 definitions]
microwave oven an oven that cooks or heats food or beverages quickly using high-frequency radiation.
mid2 amid or among.
mid- a prefix that means "middle."
Midas a king in Greek mythology who was given the power to turn everything he touched into gold.
midday the middle part of the day.
middle halfway between two things, places, or points. [2 definitions]
middle age the period of human life between youth and old age, or the years between forty and sixty-five.
middle-aged of a person, being of an age between youth and old age. A middle-aged person is often between forty and sixty-five years of age.
Middle Ages the period of European history between ancient times and the Renaissance, from A.D. 500 to A.D. 1500.
middle class the class of people between the rich and the poor.
Middle East the region along the southeastern and eastern border of the Mediterranean Sea, from Libya in North Africa to Afghanistan in Asia.
Middle English the English language as it was spoken and written between the years 1100 and 1500.
Middle West see "Midwest."
midget a very small person with the same body proportions as a normal adult; dwarf.
midland the interior part of a region or country. [2 definitions]
midnight twelve o'clock at night.