| abetalipoproteinemia | (noun) a rare inherited disorder of fat metabolism; characterized by severe deficiency of beta-lipoproteins and abnormal red blood cells (acanthocytes) and abnormally low cholesterol levels | - |
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| acarpous | (adjective) producing no fruit | - |
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| acrocarpous | (adjective) (of mosses) having the archegonia at the top of the stem | - |
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| acropolis | (noun) the citadel in ancient Greek towns | - |
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| actinopod | (noun) protozoa having stiff rodlike radiating pseudopods | - |
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| adenohypophysis | (noun) the anterior lobe of the pituitary body; primarily glandular in nature | Synonyms: anterior pituitary, anterior pituitary gland |
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| adipose | (adjective) composed of animal fat | - |
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| adiposeness | (noun) having the property of containing fat | Synonyms: adiposity, fattiness |
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| adiposis | (noun) the property of excessive fatness | Synonyms: corpulence, overweight, stoutness |
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| adiposity | (noun) having the property of containing fat | Synonyms: adiposeness, fattiness |
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| aeciospore | (noun) spore of a rust fungus formed in an aecium | - |
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| airport | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: aerodrome, airdrome, drome |
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| airpost | (noun) a system of conveying mail by aircraft | Synonyms: airmail |
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| amphipod | (noun) a kind of malacostracan crustacean | - |
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| amphitropous | (adjective) (of a plant ovule) partly inverted; turned back 90 degrees on its stalk | - |
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| ampoule | (noun) a small bottle that contains a drug (especially a sealed sterile container for injection by needle) | Synonyms: ampul, ampule, phial, vial |
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| anatropous | (adjective) (of a plant ovule) completely inverted; turned back 180 degrees on its stalk | Synonyms: inverted |
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| angiocarpous | (adjective) having or being fruit enclosed in a shell or husk | Synonyms: angiocarpic |
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| anthropocentric | (adjective) human-centered | - |
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| anthropocentricity | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentrism |
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| anthropocentrism | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentricity |
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| anthropogenesis | (noun) the evolution or genesis of the human race | Synonyms: anthropogeny |
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| anthropogenetic | (adjective) of or relating to the study of the origins and development of human beings | Synonyms: anthropogenic |
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| anthropogenic | (adjective) of or relating to the study of the origins and development of human beings | Synonyms: anthropogenetic |
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| anthropogeny | (noun) the evolution or genesis of the human race | Synonyms: anthropogenesis |
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| anthropoid | (adjective) resembling human beings | Synonyms: manlike |
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| (adjective) resembling apes | Synonyms: anthropoidal, apelike |
| (noun) any member of the suborder Anthropoidea including monkeys and apes and hominids | - |
| (noun) person who resembles a nonhuman primate | Synonyms: ape |
| anthropoidal | (adjective) resembling apes | Synonyms: anthropoid, apelike |
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| anthropolatry | (noun) the worship of human beings | Synonyms: worship of man |
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| anthropological | (adjective) of or concerned with the science of anthropology | - |
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| anthropologism | (noun) a point of view in which human nature is exhaustively determined by the culture in which a person lives, leaving no room for human agency. | - |
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| anthropologist | (noun) a social scientist who specializes in anthropology | - |
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| anthropology | (noun) the social science that studies the origins and social relationships of human beings | - |
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| anthropometric | (adjective) of or relating to anthropometry | Synonyms: anthropometrical |
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| anthropometrical | (adjective) of or relating to anthropometry | Synonyms: anthropometric |
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| anthropometry | (noun) measurement and study of the human body and its parts and capacities | - |
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| anthropomorphic | (adjective) suggesting human characteristics for animals or inanimate things | Synonyms: anthropomorphous, humanlike |
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| anthropomorphise | (verb) ascribe human features to something | Synonyms: anthropomorphize |
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| anthropomorphism | (noun) the representation of objects (especially a god) as having human form or traits | Synonyms: theanthropism |
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| anthropomorphize | (verb) ascribe human features to something | Synonyms: anthropomorphise |
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| anthropomorphous | (adjective) suggesting human characteristics for animals or inanimate things | Synonyms: anthropomorphic, humanlike |
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| anthropopathism | (noun) Attribution of human feelings to things not human, such as inanimate objects, animals, or natural phenomena. | - |
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| anthropophagite | (noun) a person who eats human flesh | Synonyms: anthropophagus, cannibal, man-eater |
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| anthropophagous | (adjective) of or relating to eaters of human flesh | - |
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| anthropophagus | (noun) a person who eats human flesh | Synonyms: anthropophagite, cannibal, man-eater |
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| anthropophagy | (noun) human cannibalism; the eating of human flesh | - |
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| anthroposophy | (noun) a system of beliefs and practices based on the philosophy of Rudolf Steiner; it claims to integrate the practical and psychological in child-centered education | - |
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| antimonopoly | (adjective) of laws and regulations; designed to protect trade and commerce from unfair business practices | Synonyms: antitrust |
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| antipodal | (adjective) relating to the antipodes or situated at opposite sides of the earth | Synonyms: antipodean |
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| (noun) the relation of opposition along a diameter | Synonyms: antipodal opposition, diametrical opposition |
| antipode | (noun) direct opposite | - |
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| antipodean | (adjective) relating to the antipodes or situated at opposite sides of the earth | Synonyms: antipodal |
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| antipodes | (noun) any two places or regions on diametrically opposite sides of the Earth | - |
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| antipollution | (adjective) intended to reduce pollution | - |
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| antipope | (noun) someone who is elected pope in opposition to another person who is held to be canonically elected | - |
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| antiredeposition | (noun) the process of preventing redeposition | - |
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| apoapsis | (noun) (astronomy) the point in an orbit farthest from the body being orbited | Synonyms: point of apoapsis |
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| apocalypse | (noun) a cosmic cataclysm in which God destroys the ruling powers of evil | - |
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| apocalyptic | (adjective) of or relating to an apocalypse | - |
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| (adjective) prophetic of devastation or ultimate doom | Synonyms: apocalyptical, revelatory |
| apocalyptical | (adjective) prophetic of devastation or ultimate doom | Synonyms: apocalyptic, revelatory |
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| apocarpous | (adjective) (of ovaries of flowering plants) consisting of carpels that are free from one another as in buttercups or roses | - |
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| apochromatic | (adjective) corrected for both chromatic and spherical aberration | - |
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| apocope | (noun) abbreviation of a word by omitting the final sound or sounds | - |
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| apocrine | (adjective) (of exocrine glands) producing a secretion in which part of the secreting cell is released with the secretion | - |
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| apocryphal | (adjective) being of questionable authenticity | - |
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| apocryphalness | (noun) The property of being of doubtful authenticity, of lacking authority, or of not being regarded as canonical. | - |
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| (noun) The property of being of dubious veracity; of questionable accuracy or truthfulness. | - |
| apocynaceous | (adjective) of or relating to tropical plants of the family Apocynaceae | - |
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| apodal | (adjective) (of snakes and eels) naturally footless | Synonyms: apodous |
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| apodeictic | (adjective) of a proposition; necessarily true or logically certain | Synonyms: apodictic |
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| apodeme | (noun) ridge-like ingrowth of the exoskeleton of an arthropod that supports internal organs and provides attachment points for muscles | - |
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| apodictic | (adjective) of a proposition; necessarily true or logically certain | Synonyms: apodeictic |
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| apodous | (adjective) (of snakes and eels) naturally footless | Synonyms: apodal |
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| apoenzyme | (noun) a protein that combines with a coenzyme to form an active enzyme | - |
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| apogametic | (adjective) of or relating to the development of an embryo in the absence of fertilization | Synonyms: apogamic, apogamous |
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| apogamic | (adjective) of or relating to the development of an embryo in the absence of fertilization | Synonyms: apogametic, apogamous |
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| apogamous | (adjective) of or relating to the development of an embryo in the absence of fertilization | Synonyms: apogametic, apogamic |
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| apogamy | (noun) (botany) development of an embryo without fertilization; especially the development in some ferns of a sporophyte from the gametophyte without fertilization | - |
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| apogean | (adjective) relating to or characteristic of an apogee | - |
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| apogee | (noun) apoapsis in Earth orbit; the point in its orbit where a satellite is at the greatest distance from the Earth | - |
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| (noun) a final climactic stage | Synonyms: culmination |
| apojove | (noun) apoapsis in orbit around Jupiter | - |
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| apolemia | (noun) large siphonophore of up to 50 ft long | - |
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| apolitical | (adjective) politically neutral | Synonyms: unpolitical |
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| apoliticism | (noun) Apathy and/or antipathy towards all political affiliations. | - |
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| apologetic | (adjective) offering or expressing apology | Synonyms: excusatory |
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| apologetically | (adverb) in an apologetic manner | - |
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| apologetics | (noun) the branch of theology that is concerned with the defense of Christian doctrines | - |
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| apologia | (noun) a formal written defense of something you believe in strongly | Synonyms: apology |
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| apologise | (verb) acknowledge faults or shortcomings or failing | Synonyms: apologize |
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| (verb) defend, explain, clear away, or make excuses for by reasoning | Synonyms: apologize, excuse, rationalise, rationalize |
| apologist | (noun) a person who argues to defend or justify some policy or institution | Synonyms: justifier, vindicator |
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| apologize | (verb) acknowledge faults or shortcomings or failing | Synonyms: apologise |
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| (verb) defend, explain, clear away, or make excuses for by reasoning | Synonyms: apologise, excuse, rationalise, rationalize |
| apologue | (noun) a short moral story (often with animal characters) | Synonyms: allegory, fable, parable |
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| apology | (noun) a poor example | Synonyms: excuse |
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| (noun) an expression of regret at having caused trouble for someone | - |
| (noun) a formal written defense of something you believe in strongly | Synonyms: apologia |
| apolune | (noun) apoapsis in orbit around the moon | Synonyms: aposelene |
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| apomict | (noun) a plant that reproduces or is reproduced by apomixis | - |
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| apomictic | (adjective) of or relating to a plant that reproduces by apomixis | Synonyms: apomictical |
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| (adjective) (of reproduction) not involving the fusion of male and female gametes in reproduction | Synonyms: agamic, agamogenetic, agamous, parthenogenetic |
| apomictical | (adjective) of or relating to a plant that reproduces by apomixis | Synonyms: apomictic |
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| apomixis | (noun) any of several kinds of reproduction without fertilization | - |
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| apomorphine | (noun) a morphine derivative that is not as strong as morphine; used as an emetic and in small doses as a sedative | - |
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| aponeurosis | (noun) any of the deeper and thicker fascia that attach muscles to bones; resemble flattened tendons | - |
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| aponeurotic | (adjective) of or relating to an aponeurosis | - |
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| apopemptic | (adjective) addressed to one who is departing | - |
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| apophasis | (noun) mentioning something by saying it will not be mentioned | - |
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