| metabola | (noun) insects that undergo complete metamorphosis | Synonyms: holometabola |
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| metabolism | (noun) the organic processes (in a cell or organism) that are necessary for life | Synonyms: metabolic process |
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| (noun) the marked and rapid transformation of a larva into an adult that occurs in some animals | Synonyms: metamorphosis |
| metabolite | (noun) any substance involved in metabolism (either as a product of metabolism or as necessary for metabolism) | - |
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| metacarpal | (noun) any bone of the hand between the wrist and fingers | Synonyms: metacarpal bone |
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| metacarpus | (noun) the part of the hand between the carpus and phalanges | - |
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| metacenter | (noun) (shipbuilding) the point of intersection between two vertical lines, one line through the center of buoyancy of the hull of a ship in equilibrium and the other line through the center of buoyancy of the hull when the ship is inclined to one side; the distance of this intersection above the center of gravity is an indication of the stability of the ship | Synonyms: metacentre |
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| metacentre | (noun) (shipbuilding) the point of intersection between two vertical lines, one line through the center of buoyancy of the hull of a ship in equilibrium and the other line through the center of buoyancy of the hull when the ship is inclined to one side; the distance of this intersection above the center of gravity is an indication of the stability of the ship | Synonyms: metacenter |
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| metacyesis | (noun) pregnancy resulting from gestation elsewhere than in the uterus | Synonyms: eccyesis, ectopic gestation, ectopic pregnancy, extrauterine gestation, extrauterine pregnancy |
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| metadata | (noun) data about data | - |
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| metagenesis | (noun) alternation of sexual and asexual generations | Synonyms: digenesis |
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| metaknowledge | (noun) knowledge about knowledge | - |
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| metal | (noun) any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. | Synonyms: metallic element |
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| (noun) a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten | Synonyms: alloy |
| metalanguage | (noun) a language that can be used to describe languages | - |
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| metalepsis | (noun) substituting metonymy of one figurative sense for another | - |
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| metalhead | (noun) a fan of heavy metal music | - |
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| metallic | (noun) a yarn made partly or entirely of metal | - |
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| (noun) a fabric made of a yarn that is partly or entirely of metal | - |
| metallicity | (noun) The state of possessing a similar aural resonance to metal. | - |
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| metallurgist | (noun) an engineer trained in the extraction and refining and alloying and fabrication of metals | Synonyms: metallurgical engineer |
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| metallurgy | (noun) the science and technology of metals | - |
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| metalware | (noun) household articles made of metal (especially for use at table) | - |
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| metalwork | (noun) the activity of making things out of metal in a skillful manner | Synonyms: metalworking |
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| (noun) the metal parts of something | - |
| metalworker | (noun) someone who works metal (especially by hammering it when it is hot and malleable) | Synonyms: smith |
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| metalworking | (noun) the activity of making things out of metal in a skillful manner | Synonyms: metalwork |
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| metalworks | (noun) factory where metal castings are produced | Synonyms: foundry |
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| metamathematics | (noun) the logical analysis of mathematical reasoning | - |
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| metamere | (noun) one of a series of similar body segments into which some animals are divided longitudinally | Synonyms: somite |
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| metamorphism | (noun) change in the structure of rock by natural agencies such as pressure or heat or introduction of new chemical substances | - |
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| metamorphopsia | (noun) a defect of vision in which objects appear to be distorted; usually due to a defect in the retina | - |
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| metamorphosis | (noun) a complete change of physical form or substance especially as by magic or witchcraft | - |
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| (noun) a striking change in appearance or character or circumstances | Synonyms: transfiguration |
| (noun) the marked and rapid transformation of a larva into an adult that occurs in some animals | Synonyms: metabolism |
| metaphase | (noun) the second stage of mitosis | - |
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| (noun) the second stage of meiosis | - |
| metaphor | (noun) a figure of speech in which an expression is used to refer to something that it does not literally denote in order to suggest a similarity | - |
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| metaphysics | (noun) the philosophical study of being and knowing | - |
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| metaphysis | (noun) the growing part of a long bone between the diaphysis and the epiphysis | - |
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| metaproterenol | (noun) a bronchodilator (trade name Alupent) used to treat asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects include tachycardia and shakiness | Synonyms: Alupent |
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| metarule | (noun) a rule that describes how other rules should be used (as in AI) | - |
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| metasequoia | (noun) large fast-growing Chinese monoecious tree having flat bright-green deciduous leaves and small globular cones; commonly cultivated in United States as an ornamental; known as a fossil before being discovered in China | Synonyms: dawn redwood, Metasequoia glyptostrodoides |
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| metastability | (noun) the quality of a physical system that persists in its existing equilibrium when undisturbed (or only slightly disturbed) but able to pass to a more stable equilibrium when sufficiently disturbed | - |
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| metastasis | (noun) the spreading of a disease (especially cancer) to another part of the body | - |
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| metatarsal | (noun) any bone of the foot between the ankle and the toes | - |
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| metatarsus | (noun) the skeleton of the human foot between the toes and the tarsus; the corresponding part of the foot in birds or of the hind foot in quadrupeds | - |
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| metatherian | (noun) primitive pouched mammals found mainly in Australia and the Americas | - |
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| metathesis | (noun) a chemical reaction between two compounds in which parts of each are interchanged to form two new compounds (AB+CD=AD+CB) | Synonyms: double decomposition, double decomposition reaction |
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| (noun) a linguistic process of transposition of sounds or syllables within a word or words within a sentence | - |
| metazoan | (noun) any animal of the subkingdom Metazoa; all animals except protozoans and sponges | - |
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