| aboveground | (adjective) on or above the surface of the ground | - |
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| abroach | (adjective) of a cask or barrel | Synonyms: broached |
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| abroad | (adjective) in a foreign country | Synonyms: overseas |
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| acerose | (adjective) narrow and long and pointed; as pine leaves | Synonyms: acerate, acicular, needle-shaped |
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| achondroplastic | (adjective) of or relating to achondroplasia | - |
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| achromatic | (adjective) having no hue | Synonyms: neutral |
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| achromatinic | (adjective) (of substance of a cell nucleus) not readily colored by stains | - |
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| achromatous | (adjective) having little or inadequate color | - |
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| achromic | (adjective) having no color | Synonyms: achromous |
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| achromous | (adjective) having no color | Synonyms: achromic |
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| acrobatic | (adjective) vigorously active | Synonyms: athletic, gymnastic |
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| acrocarpous | (adjective) (of mosses) having the archegonia at the top of the stem | - |
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| acrocentric | (adjective) having a subterminal centromere | - |
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| acrogenic | (adjective) pertaining to flowerless plants (ferns or mosses) in which growth occurs only at the tip of the main stem | Synonyms: acrogenous |
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| acrogenous | (adjective) pertaining to flowerless plants (ferns or mosses) in which growth occurs only at the tip of the main stem | Synonyms: acrogenic |
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| acromegalic | (adjective) marked or affected by enlargement or hypertrophy of the extremities or the face | - |
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| acronymic | (adjective) characterized by the use of acronyms | Synonyms: acronymous |
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| acronymous | (adjective) characterized by the use of acronyms | Synonyms: acronymic |
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| acropetal | (adjective) of leaves or flowers; developing or opening in succession from base to apex | - |
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| acrophobic | (adjective) suffering from acrophobia; abnormally afraid of high places | - |
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| acroscopic | (adjective) facing or on the side toward the apex | - |
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| adrenocorticotrophic | (adjective) stimulating or acting on the adrenal cortex | Synonyms: adrenocorticotropic |
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| adrenocorticotropic | (adjective) stimulating or acting on the adrenal cortex | Synonyms: adrenocorticotrophic |
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| adroit | (adjective) quick or skillful or adept in action or thought | - |
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| adulterous | (adjective) characterized by adultery | Synonyms: extracurricular, extramarital |
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| (adjective) not faithful to a spouse or lover | Synonyms: cheating, two-timing |
| adventurous | (adjective) willing to undertake or seeking out new and daring enterprises | Synonyms: adventuresome |
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| aeolotropic | (adjective) having properties with different values along different axes | Synonyms: eolotropic |
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| aeriferous | (adjective) conveying air; as the bronchial tubes | - |
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| aerobic | (adjective) depending on free oxygen or air | Synonyms: aerophilic, aerophilous |
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| (adjective) based on or using the principles of aerobics; enhancing respiratory and circulatory efficiency | - |
| aerobiotic | (adjective) living or active only in the presence of oxygen | - |
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| aerodynamic | (adjective) of or relating to aerodynamics | - |
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| (adjective) designed or arranged to offer the least resistance to fluid flow | Synonyms: flowing, sleek, streamlined |
| aerolitic | (adjective) of or pertaining to certain stony meteorites | - |
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| aerological | (adjective) of or pertaining to aerology | - |
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| aeromechanic | (adjective) of or pertaining to aerodynamics | - |
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| aeromedical | (adjective) of or relating to aviation medicine | - |
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| aeronautic | (adjective) of or pertaining to aeronautics | Synonyms: aeronautical |
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| aeronautical | (adjective) of or pertaining to aeronautics | Synonyms: aeronautic |
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| aerophilatelic | (adjective) of or relating to airmail stamps | - |
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| aerophilic | (adjective) depending on free oxygen or air | Synonyms: aerobic, aerophilous |
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| aerophilous | (adjective) depending on free oxygen or air | Synonyms: aerobic, aerophilic |
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| aerosolised | (adjective) in the form of ultramicroscopic solid or liquid particles dispersed or suspended in air or gas | Synonyms: aerosolized |
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| aerosolized | (adjective) in the form of ultramicroscopic solid or liquid particles dispersed or suspended in air or gas | Synonyms: aerosolised |
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| agrobiologic | (adjective) of or pertaining to agrobiology | Synonyms: agrobiological |
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| agrobiological | (adjective) of or pertaining to agrobiology | Synonyms: agrobiologic |
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| agrologic | (adjective) of or related to agrology | Synonyms: agrological |
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| agrological | (adjective) of or related to agrology | Synonyms: agrologic |
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| agronomic | (adjective) of or relating to or promoting agronomy | Synonyms: agronomical |
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| agronomical | (adjective) of or relating to or promoting agronomy | Synonyms: agronomic |
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| aground | (adjective) stuck in a place where a ship can no longer float | - |
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| aleuronic | (adjective) of or related to aleurone | - |
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| allegro | (adjective) (of tempo) fast | - |
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| allochronic | (adjective) (of taxa) occurring in different geologic times | - |
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| allomerous | (adjective) pertaining to allomerism | - |
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| allotropic | (adjective) of or related to or exhibiting allotropism | Synonyms: allotropical |
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| allotropical | (adjective) of or related to or exhibiting allotropism | Synonyms: allotropic |
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| aluminiferous | (adjective) containing alum or aluminum | - |
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| amaurotic | (adjective) pertaining to blindness caused by amaurosis | - |
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| ambidextrous | (adjective) equally skillful with each hand | Synonyms: two-handed |
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| (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: deceitful, double-dealing, double-faced, double-tongued, duplicitous, Janus-faced, two-faced |
| ambrosial | (adjective) worthy of the gods | Synonyms: ambrosian |
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| (adjective) extremely pleasing to the taste; sweet and fragrant | Synonyms: ambrosian, nectarous |
| ambrosian | (adjective) worthy of the gods | Synonyms: ambrosial |
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| (adjective) extremely pleasing to the taste; sweet and fragrant | Synonyms: ambrosial, nectarous |
| amentiferous | (adjective) (of plants) bearing or characterized by aments or catkins | Synonyms: amentaceous |
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| ametropic | (adjective) of or relating to an abnormal condition of the eye in which visual images are not in focus on the retina | - |
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| amorous | (adjective) inclined toward or displaying love | Synonyms: amative |
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| (adjective) expressive of or exciting sexual love or romance | Synonyms: amatory, romantic |
| amphiprostylar | (adjective) marked by columniation having free columns in porticoes either at both ends or at both sides of a structure | Synonyms: amphiprostyle, amphistylar, porticoed |
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| amphiprostyle | (adjective) marked by columniation having free columns in porticoes either at both ends or at both sides of a structure | Synonyms: amphiprostylar, amphistylar, porticoed |
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| amphiprotic | (adjective) having characteristics of both an acid and a base and capable of reacting as either | Synonyms: amphoteric |
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| amphitropous | (adjective) (of a plant ovule) partly inverted; turned back 90 degrees on its stalk | - |
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| anachronic | (adjective) chronologically misplaced | Synonyms: anachronistic, anachronous |
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| anachronistic | (adjective) chronologically misplaced | Synonyms: anachronic, anachronous |
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| anachronous | (adjective) chronologically misplaced | Synonyms: anachronic, anachronistic |
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| anadromous | (adjective) migrating from the sea to fresh water to spawn | - |
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| anaerobic | (adjective) living or active in the absence of free oxygen | Synonyms: anaerobiotic |
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| (adjective) not aerobic | - |
| anaerobiotic | (adjective) living or active in the absence of free oxygen | Synonyms: anaerobic |
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| anaphrodisiac | (adjective) tending to diminish sexual desire | - |
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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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| androgenetic | (adjective) of or related to androgenesis | Synonyms: androgenous |
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| androgenic | (adjective) of or related to the male hormone androgen | - |
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| androgenous | (adjective) of or related to androgenesis | Synonyms: androgenetic |
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| androgynous | (adjective) having both male and female characteristics | - |
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| (adjective) relating to or exhibiting both female and male sex organs but with a predominantly female appearance | - |
| aneroid | (adjective) containing no liquid or actuated without the use of liquid | - |
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| anestrous | (adjective) (of lower mammals) not in a state of estrus; not in heat | - |
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| (adjective) of or relating to anestrus | Synonyms: anestric, anoestrous |
| anhydrous | (adjective) without water; especially without water of crystallization | - |
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| anisometropic | (adjective) relating to a difference in the refractive power of the two eyes | - |
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| anisotropic | (adjective) not invariant with respect to direction | - |
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| anoestrous | (adjective) of or relating to anestrus | Synonyms: anestric, anestrous |
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| anterograde | (adjective) of amnesia; affecting time immediately following trauma | - |
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| anthropic | (adjective) relating to mankind or the period of mankind's existence | Synonyms: anthropical |
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| anthropical | (adjective) relating to mankind or the period of mankind's existence | Synonyms: anthropic |
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| anthropocentric | (adjective) human-centered | - |
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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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| anthropoid | (adjective) resembling human beings | Synonyms: manlike |
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| (adjective) resembling apes | Synonyms: anthropoidal, apelike |
| anthropoidal | (adjective) resembling apes | Synonyms: anthropoid, apelike |
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| anthropological | (adjective) of or concerned with the science of anthropology | - |
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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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| anthropomorphic | (adjective) suggesting human characteristics for animals or inanimate things | Synonyms: anthropomorphous, humanlike |
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| anthropomorphous | (adjective) suggesting human characteristics for animals or inanimate things | Synonyms: anthropomorphic, humanlike |
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| anthropophagous | (adjective) of or relating to eaters of human flesh | - |
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| antidromic | (adjective) conducting nerve impulses in a direction opposite to normal | - |
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