| acidulent | (adjective) being sour to the taste | Synonyms: acid, acidic, acidulous |
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| acidulous | (adjective) being sour to the taste | Synonyms: acid, acidic, acidulent |
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| aciduric | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, acidophilous |
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| acinar | (adjective) pertaining to the individual parts making up an aggregate fruit like a blackberry | - |
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| (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinic, acinose, acinous |
| acinic | (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinar, acinose, acinous |
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| acinose | (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinar, acinic, acinous |
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| acinous | (adjective) pertaining to one of the small sacs (as in a compound gland) | Synonyms: acinar, acinic, acinose |
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| acknowledgeable | (adjective) capable of being acknowledged | - |
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| acknowledged | (adjective) recognized or made known or admitted | - |
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| (adjective) generally accepted | - |
| acned | (adjective) (of complexion) blemished by imperfections of the skin | Synonyms: pimpled, pimply, pustulate |
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| acneiform | (adjective) resembling acne | - |
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| acold | (adjective) of persons; feeling cold | - |
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| acoustic | (adjective) of or relating to the science of acoustics | Synonyms: acoustical |
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| acoustical | (adjective) of or relating to the science of acoustics | Synonyms: acoustic |
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| acquainted | (adjective) having fair knowledge of | - |
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| acquiescent | (adjective) willing to carry out the orders or wishes of another without protest | Synonyms: biddable |
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| acquirable | (adjective) capable of being acquired | - |
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| acquired | (adjective) gotten through environmental forces | - |
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| acquisitive | (adjective) eager to acquire and possess things especially material possessions or ideas | - |
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| acquitted | (adjective) declared not guilty of a specific offense or crime; legally blameless | Synonyms: not guilty |
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| acrid | (adjective) strong and sharp | Synonyms: pungent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acrimonious | (adjective) marked by strong resentment or cynicism | Synonyms: bitter |
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| acritical | (adjective) without a crisis (as of some diseases) | - |
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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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| actable | (adjective) capable of being acted; suitable for the stage | - |
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| actinal | (adjective) (of radiate organisms) located on the surface or end on which the mouth is situated | - |
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| acting | (adjective) serving temporarily especially as a substitute | - |
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| actinic | (adjective) relating to or exhibiting actinism | - |
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| actinoid | (adjective) having a radial form | - |
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| actinometric | (adjective) of or related to actinometry | Synonyms: actinometrical |
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| actinometrical | (adjective) of or related to actinometry | Synonyms: actinometric |
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| actinomorphic | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphous |
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| actinomorphous | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphic |
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| actinomycetal | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetous |
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| actinomycetous | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetal |
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| actinomycotic | (adjective) of or related to actinomycosis infection | - |
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| actionable | (adjective) affording grounds for legal action | - |
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| activated | (adjective) rendered active; e.g. rendered radioactive or luminescent or photosensitive or conductive | - |
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| (adjective) (military) set up and placed on active assignment | - |
| (adjective) (of e.g. a molecule) made reactive or more reactive | Synonyms: excited |
| (adjective) (of sewage) treated with aeration and bacteria to aid decomposition | - |
| activating | (adjective) causing motion or action or change | Synonyms: actuating |
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| active | (adjective) (used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water')) expressing action rather than a state of being | Synonyms: dynamic |
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| (adjective) characterized by energetic activity | - |
| (adjective) tending to become more severe or wider in scope | - |
| (adjective) disposed to take action or effectuate change | - |
| (adjective) (of e.g. volcanoes) erupting or liable to erupt | - |
| (adjective) (of e.g. volcanoes) capable of erupting | - |
| (adjective) full of activity or engaged in continuous activity | - |
| (adjective) exerting influence or producing a change or effect | - |
| (adjective) engaged in full-time work | - |
| (adjective) expressing that the subject of the sentence has the semantic function of actor: | - |
| (adjective) (of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions | - |
| (adjective) in operation | Synonyms: alive |
| (adjective) taking part in an activity | Synonyms: participating |
| (adjective) engaged in or ready for military or naval operations | Synonyms: combat-ready, fighting |
| activist | (adjective) advocating or engaged in activism | Synonyms: activistic |
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| activistic | (adjective) advocating or engaged in activism | Synonyms: activist |
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| actual | (adjective) presently existing in fact and not merely potential or possible | Synonyms: existent |
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| (adjective) being or existing at the present moment | - |
| (adjective) taking place in reality; not pretended or imitated | - |
| (adjective) being or reflecting the essential or genuine character of something | Synonyms: genuine, literal, real |
| (adjective) existing in act or fact | Synonyms: factual |
| actuarial | (adjective) of or relating to the work of an actuary | - |
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| actuated | (adjective) moved to action | - |
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| actuating | (adjective) causing motion or action or change | Synonyms: activating |
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| acuate | (adjective) ending in a sharp point | Synonyms: acute, needlelike, sharp |
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| aculeate | (adjective) having or resembling a stinger or barb | Synonyms: aculeated |
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| aculeated | (adjective) having or resembling a stinger or barb | Synonyms: aculeate |
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| acuminate | (adjective) (of a leaf shape) narrowing to a slender point | - |
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| acute | (adjective) having or experiencing a rapid onset and short but severe course | - |
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| (adjective) of an angle; less than 90 degrees | - |
| (adjective) of critical importance and consequence | - |
| (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp |
| (adjective) ending in a sharp point | Synonyms: acuate, needlelike, sharp |
| (adjective) extremely sharp or severe | Synonyms: intense |
| acyclic | (adjective) not cyclic; especially having parts arranged in spirals rather than whorls | - |
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| (adjective) having an open chain structure | Synonyms: open-chain |