| acroanaesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanesthesia |
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| acroanesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanaesthesia |
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| acrobat | (noun) an athlete who performs acts requiring skill and agility and coordination | - |
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| acrobatics | (noun) the gymnastic moves of an acrobat | Synonyms: tumbling |
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| (noun) the performance of stunts while in flight in an aircraft | Synonyms: aerobatics, stunt flying, stunting |
| acrocarp | (noun) a moss in which the main axis is terminated by the archegonium (and hence the capsule) | Synonyms: acrocarpous moss |
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| acrocephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: oxycephaly |
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| acrocyanosis | (noun) cyanosis of the extremities; can occur when a spasm of the blood vessels is caused by exposure to cold or by strong emotion | Synonyms: Raynaud's sign |
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| acrodont | (noun) an animal having teeth consolidated with the summit of the alveolar ridge without sockets | - |
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| acrogen | (noun) any flowerless plant such as a fern (pteridophyte) or moss (bryophyte) in which growth occurs only at the tip of the main stem | - |
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| acrolein | (noun) a pungent colorless unsaturated liquid aldehyde made from propene | Synonyms: propenal |
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| acromegalia | (noun) enlargement of bones of hands and feet and face; often accompanied by headache and muscle pain and emotional disturbances; caused by overproduction of growth hormone by the anterior pituitary gland (due to a tumor) | Synonyms: acromegaly |
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| acromegaly | (noun) enlargement of bones of hands and feet and face; often accompanied by headache and muscle pain and emotional disturbances; caused by overproduction of growth hormone by the anterior pituitary gland (due to a tumor) | Synonyms: acromegalia |
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| acromicria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromikria |
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| acromikria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromicria |
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| acromion | (noun) the outermost point of the spine of the shoulder blade | Synonyms: acromial process |
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| acromphalus | (noun) abnormal protrusion of the navel; sometimes the start of umbilical hernia | - |
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| acromyotonia | (noun) myotonia of the extremities only; causes spastic deformity of the hand or foot | - |
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| acronym | (noun) a word formed from the initial letters of the several words in the name and pronounced as one word | Synonyms: initialism |
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| acrophobia | (noun) a morbid fear of great heights | - |
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| acrophony | (noun) naming a letter of the alphabet by using a word whose initial sound is the sound represented by that letter | - |
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| acropolis | (noun) the citadel in ancient Greek towns | - |
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| acrosome | (noun) a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg | - |
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| acrostic | (noun) a puzzle where you fill a square grid with words reading the same down as across | Synonyms: word square |
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| (noun) verse in which certain letters such as the first in each line form a word or message | - |
| lacrosse | (noun) a game invented by American Indians; now played by two teams who use long-handled rackets to catch and carry and throw the ball toward the opponents' goal | - |
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| macro | (noun) a single computer instruction that results in a series of instructions in machine language | Synonyms: macro instruction |
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| macrobiotics | (noun) the theory of promoting health and longevity by means of diet (especially whole beans and grains) | - |
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| macrocephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: megacephaly, megalocephaly |
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| macrocosm | (noun) everything that exists anywhere | Synonyms: cosmos, creation, existence, universe, world |
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| macrocyte | (noun) abnormally large red blood cell (associated with pernicious anemia) | Synonyms: megalocyte |
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| macrocytosis | (noun) the presence of macrocytes in the blood | - |
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| macroeconomics | (noun) the branch of economics that studies the overall working of a national economy | - |
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| macroeconomist | (noun) an economist who specializes in macroeconomics | Synonyms: macroeconomic expert |
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| macroelement | (noun) a chemical element required in relatively large quantities for the normal physiologic processes of the body. | Synonyms: major mineral |
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| macroevolution | (noun) evolution on a large scale extending over geologic era and resulting in the formation of new taxonomic groups | - |
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| macroglia | (noun) tissue consisting of large stellate neuroglial cells | Synonyms: astroglia |
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| macroglossia | (noun) a congenital disorder characterized by an abnormally large tongue; often seen in cases of Down's syndrome | - |
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| macromolecule | (noun) any very large complex molecule; found only in plants and animals | Synonyms: supermolecule |
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| macron | (noun) a diacritical mark (-) placed above a vowel to indicate a long sound | - |
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| macrophage | (noun) a large phagocyte; some are fixed and other circulate in the blood stream | - |
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| macrosporangium | (noun) a plant structure that produces megaspores | Synonyms: megasporangium |
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| macrospore | (noun) larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte | Synonyms: megaspore |
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| macrotus | (noun) large-eared greyish bat of southern California and northwestern Mexico | Synonyms: Macrotus californicus |
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| macrozamia | (noun) any treelike cycad of the genus Macrozamia having erect trunks and pinnate leaves and large cones with sometimes edible nuts; Australia | - |
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| phalacrosis | (noun) the condition of having no hair on the top of the head | Synonyms: baldness |
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