metemptosisThe suppression of a day in the calendar to prevent the date of the new moon being set a day too late, or the suppression of the leap day once in 134 years.
metencephalonThe portion of the embryonic rhombencephalon from which the pons and cerebellum arise.
metendosterniteAn internal skeletal structure found in insects.
metenkephalinAn endogenous opioid peptide neurotransmitter found naturally in many parts of the animal and human body; one of the two forms of enkephalin (the other being leuenkephalin)
metensomatosisA change of body by the soul, reincarnation, metempsychosis.
meteogramA chart showing one or more numeric weather variables, such as temperature, precipitation, or wind speed, measured along a horizontal axis, nearly always time.
meteorAn atmospheric or meteorological phenomenon. These were sometimes classified as aerial or airy meteors (winds), aqueous or watery meteors (hydrometeors: clouds, rain, snow, hail, dew, frost), luminous meteors (rainbows and aurora), and igneous or fiery meteors (lightning and shooting stars).
meteorismA rapid accumulation of gas in the intestine. It is typically a sign of bowel necrosis from bacterial infection, a life-threatening surgical emergency, and is usually caused by the consumption of large quantities of undercooked pork.
metestrusA phase of the oestrus cycle where the signs of oestrogen stimulation subside, the corpus luteum starts to form, and the uterine lining begins to secrete small amounts of progesterone.
metetherealLying beyond the ether, in the spiritual, transcendent realm where the soul is held to exist in certain spiritual or spiritualist theories.
metewandA measuring rod (in both its literal and figurative sense).
meteyardA yard, staff, or rod used as a measuring device.
metflurazonA pyridazinone herbicide with chemical formula C₁₃H₁₁ClF₃N₃O.
MetfordA suburb of Newcastle in the Maitland council area, New South Wales, Australia.
metforminA biguanide derivative, C₄H₁₁N₅, used, now chiefly as the hydrochloride, as an oral hypoglycemic agent in the treatment of type 2 diabetes mellitus; 1,1-dimethylbiguanide.
methMethamphetamine, especially in the form of the crystalline hydrochloride.
methacarnA mixture of methanol, chloroform and acetic acid used as a fixative
methacholineA choline derivative with parasympathomimetic activity that can induce bronchoconstriction in asthmatics and is used in tests of airway responsiveness; O-acetyl-β-methylcholine, C₈H₁₈NO₂⁺.
methacroleina clear, colorless, flammable liquid, molecular formula C₄H₆O.
methacrylicOf or pertaining to methacrylic acid or its derivatives
methacryloylA univalent radical derived from methacrylic acid
methadoneA powerful synthetic analgesic drug which is similar to morphine in its effects but less sedative and is used as a substitute drug in the treatment of morphine and heroin addiction.
methanoicOf or pertaining to methanoic acid or its derivatives; having the group HCOO-.
methanolThe simplest aliphatic alcohol, CH₃OH; a colourless, toxic, inflammable liquid, used as a solvent, antifreeze, in the chemical industry, and in the preparation of methylated spirit.