| abscess | (noun) symptom consisting of a localized collection of pus surrounded by inflamed tissue | - |
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| abscessed | (adjective) infected and filled with pus | - |
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| abscise | (verb) remove or separate by abscission | - |
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| (verb) shed flowers and leaves and fruit following formation of a scar tissue | - |
| abscissa | (noun) the value of a coordinate on the horizontal axis | - |
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| abscission | (noun) the act of cutting something off | Synonyms: cutting off |
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| (noun) shedding of flowers and leaves and fruit following formation of scar tissue in a plant | - |
| abscond | (verb) run away; usually includes taking something or somebody along | Synonyms: absquatulate, bolt, decamp, go off, make off, run off |
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| absconder | (noun) a fugitive who runs away and hides to avoid arrest or prosecution | - |
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| abscondment | (noun) the act of running away secretly (as to avoid arrest) | Synonyms: decampment |
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| acaulescent | (adjective) (of plants) having no apparent stem above ground | Synonyms: stemless |
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| acquiesce | (verb) to agree or express agreement | Synonyms: accede, assent |
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| acquiescence | (noun) agreement with a statement or proposal to do something | Synonyms: assent |
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| (noun) acceptance without protest | - |
| acquiescent | (adjective) willing to carry out the orders or wishes of another without protest | Synonyms: biddable |
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| acroscopic | (adjective) facing or on the side toward the apex | - |
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| adolesce | (verb) become adolescent; pass through adolescence | - |
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| adolescence | (noun) in the state that someone is in between puberty and adulthood | - |
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| (noun) the time period between the beginning of puberty and adulthood | - |
| adolescent | (adjective) relating to or peculiar to or suggestive of an adolescent | - |
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| (adjective) in the state of development between puberty and maturity | - |
| (adjective) displaying or suggesting a lack of maturity | Synonyms: jejune, juvenile, puerile |
| (adjective) being of the age 13 through 19 | Synonyms: teen, teenage, teenaged |
| (noun) a juvenile between the onset of puberty and maturity | Synonyms: stripling, teen, teenager |
| adscititious | (adjective) added or derived from something outside; not inherent | - |
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| (adjective) supplemental; not part of the real or essential nature of a thing | - |
| adscript | (adjective) written or printed immediately following another character and aligned with it | - |
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| (adjective) (used of persons) bound to a tract of land; hence their service is transferable from owner to owner | Synonyms: adscripted |
| adscripted | (adjective) (used of persons) bound to a tract of land; hence their service is transferable from owner to owner | Synonyms: adscript |
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| aeschynanthus | (noun) a plant of the genus Aeschynanthus having somewhat red or orange flowers and seeds having distinctive hairs at base and apex | - |
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| aesculapian | (adjective) of or belonging to Aesculapius or the healing art | Synonyms: medical |
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| affenpinscher | (noun) European breed of small dog resembling a terrier with dark wiry hair and a tufted muzzle | Synonyms: monkey dog, monkey pinscher |
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| airscrew | (noun) a propeller that rotates to push against air | Synonyms: airplane propeller, prop |
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| albescent | (adjective) becoming or shading into white | - |
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| alcalescent | (adjective) tending to become alkaline; slightly alkaline | Synonyms: alkalescent |
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| alfresco | (adjective) in the open air | Synonyms: open-air |
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| (adverb) outside a building | Synonyms: out of doors, outdoors, outside |
| alkalescent | (adjective) tending to become alkaline; slightly alkaline | Synonyms: alcalescent |
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| ambuscade | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambush, lying in wait, trap |
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| (verb) wait in hiding to attack | Synonyms: ambush, bushwhack, lie in wait, lurk, scupper, waylay |
| angioscope | (noun) a modified microscope used to study capillary vessels | - |
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| arborescent | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| archepiscopal | (adjective) of or associated with an archbishop | Synonyms: archiepiscopal |
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| archiepiscopal | (adjective) of or associated with an archbishop | Synonyms: archepiscopal |
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| arteriolosclerosis | (noun) sclerosis of the arterioles | - |
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| arteriosclerosis | (noun) sclerosis of the arterial walls | Synonyms: arterial sclerosis, coronary-artery disease, hardening of the arteries, induration of the arteries |
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| arteriosclerotic | (adjective) affected by arteriosclerosis | - |
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| arthroscope | (noun) a type of endoscope that is inserted into a joint for visual examination | - |
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| arthroscopy | (noun) a minimally invasive operation to repair a damaged joint; the surgeon examines the joint with an arthroscope while making repairs through a small incision | - |
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| ascariasis | (noun) infestation of the human intestine with Ascaris roundworms | - |
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| ascend | (verb) slope upwards | - |
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| (verb) travel up | Synonyms: go up |
| (verb) come up, of celestial bodies | Synonyms: come up, rise, uprise |
| (verb) go along towards (a river's) source | - |
| (verb) move to a better position in life or to a better job | Synonyms: move up, rise |
| (verb) appear to be moving upward, as by means of tendrils | Synonyms: climb up |
| (verb) become king or queen | - |
| (verb) go back in order of genealogical succession | - |
| ascendable | (adjective) capable of being ascended | Synonyms: ascendible, climbable |
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| ascendance | (noun) the state that exists when one person or group has power over another | Synonyms: ascendancy, ascendence, ascendency, control, dominance |
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| ascendancy | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendence, ascendency, control, dominance |
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| ascendant | (adjective) tending or directed upward | Synonyms: ascendent, ascensive |
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| (adjective) most powerful or important or influential | Synonyms: ascendent, dominating |
| (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendent, root |
| (noun) position or state of being dominant or in control | Synonyms: ascendent |
| ascendence | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, ascendency, control, dominance |
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| ascendency | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, ascendence, control, dominance |
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| ascendent | (adjective) tending or directed upward | Synonyms: ascendant, ascensive |
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| (adjective) most powerful or important or influential | Synonyms: ascendant, dominating |
| (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendant, root |
| (noun) position or state of being dominant or in control | Synonyms: ascendant |
| ascender | (noun) (printing) the part of tall lowercase letters that extends above the other lowercase letters | - |
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| (noun) a lowercase letter that has a part extending above other lowercase letters | - |
| (noun) someone who ascends | - |
| ascendible | (adjective) capable of being ascended | Synonyms: ascendable, climbable |
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| ascending | (adjective) moving or going or growing upward | - |
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| (noun) the act of changing location in an upward direction | Synonyms: ascension, ascent, rise |
| ascension | (noun) the act of changing location in an upward direction | Synonyms: ascending, ascent, rise |
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| (noun) a movement upward; rise above the ground | Synonyms: ascent, rise, rising |
| (noun) (astronomy) the rising of a star above the horizon | - |
| ascensional | (adjective) tending to rise | - |
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| ascensive | (adjective) tending or directed upward | Synonyms: ascendant, ascendent |
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| ascent | (noun) the act of changing location in an upward direction | Synonyms: ascending, ascension, rise |
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| (noun) a movement upward; rise above the ground | Synonyms: ascension, rise, rising |
| (noun) an upward slope or grade (as in a road) | Synonyms: acclivity, climb, raise, rise, upgrade |
| ascertain | (verb) be careful or certain to do something; make certain of something | Synonyms: assure, check, control, ensure, insure, see, see to it |
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| (verb) learn or discover with certainty | - |
| (verb) find out, learn, or determine with certainty, usually by making an inquiry or other effort | Synonyms: check, determine, find out, learn, see, watch |
| (verb) establish after a calculation, investigation, experiment, survey, or study | Synonyms: determine, find, find out |
| ascertainable | (adjective) capable of being ascertained or found out | Synonyms: discoverable |
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| ascertained | (adjective) discovered or determined by scientific observation | Synonyms: discovered, observed |
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| ascesis | (noun) rigorous self-denial and active self-restraint | Synonyms: asceticism |
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| ascetic | (adjective) pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline | Synonyms: ascetical |
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| (adjective) practicing great self-denial | Synonyms: ascetical, austere, spartan |
| (noun) someone who practices self denial as a spiritual discipline | Synonyms: abstainer |
| ascetical | (adjective) pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline | Synonyms: ascetic |
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| (adjective) practicing great self-denial | Synonyms: ascetic, austere, spartan |
| ascetically | (adverb) in an ascetic manner | - |
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| asceticism | (noun) rigorous self-denial and active self-restraint | Synonyms: ascesis |
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| (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: austerity, nonindulgence |
| (noun) the doctrine that through renunciation of worldly pleasures it is possible to achieve a high spiritual or intellectual state | - |
| ascidian | (noun) minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves | - |
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| ascites | (noun) accumulation of serous fluid in peritoneal cavity | - |
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| ascitic | (adjective) of or relating to or resulting from an abnormal accumulation of protein and electrolyte rich fluid in the peritoneal cavity | - |
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| asclepiad | (noun) any plant of the family Asclepiadaceae | - |
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| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| ascocarp | (noun) mature fruiting body of an ascomycetous fungus | - |
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| ascocarpous | (adjective) of or relating to ascocarps | - |
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| ascolichen | (noun) a lichen in which the fungus component is an ascomycete | - |
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| ascoma | (noun) an ascocarp having the spore-bearing layer of cells (the hymenium) on a broad disklike receptacle | - |
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| ascomycete | (noun) any fungus of the class Ascomycetes (or subdivision Ascomycota) in which the spores are formed inside an ascus | Synonyms: ascomycetous fungus |
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| ascomycetous | (adjective) related to or characteristic of fungi of the class Ascomycetes | - |
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| ascospore | (noun) sexually produced fungal spore formed within an ascus | - |
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| ascosporic | (adjective) of or relating to ascospores | Synonyms: ascosporous |
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| ascosporous | (adjective) of or relating to ascospores | Synonyms: ascosporic |
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| ascot | (noun) a cravat with wide square ends; secured with an ornamental pin | - |
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| ascribable | (adjective) capable of being assigned or credited to | Synonyms: due, imputable, referable |
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| ascribe | (verb) attribute or credit to | Synonyms: assign, attribute, impute |
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| ascription | (noun) assigning to a cause or source | Synonyms: attribution |
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| (noun) assigning some quality or character to a person or thing | Synonyms: attribution |
| ascus | (noun) saclike structure in which ascospores are formed through sexual reproduction of ascomycetes | - |
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| atherosclerosis | (noun) a stage of arteriosclerosis involving fatty deposits (atheromas) inside the arterial walls, thus narrowing the arteries | Synonyms: coronary artery disease |
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| atherosclerotic | (adjective) of or relating to atherosclerosis | - |
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| auriscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auroscope, otoscope |
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| auroscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auriscope, otoscope |
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| auscultate | (verb) examine by auscultation | - |
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| auscultation | (noun) listening to sounds within the body (usually with a stethoscope) | - |
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| auscultatory | (adjective) of or relating to auscultation | - |
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| autofluorescence | (noun) self-induced fluorescence | - |
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| autofluorescent | (adjective) emitting light via self-induced fluorescence | - |
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| avascular | (adjective) without blood vessels | - |
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| backscatter | (verb) scatter (radiation) by the atoms of the medium through which it passes | - |
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| backscratcher | (noun) a long-handled scratcher for scratching your back | - |
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| (noun) someone who is willing to trade favors or services for mutual advantage | - |
| bagascosis | (noun) alveolitis caused by inhaling bagasse (sugarcane dust) | Synonyms: bagassosis |
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| barbasco | (noun) West Indian shrub or small tree having leathery saponaceous leaves and extremely hard wood | Synonyms: Jacquinia keyensis, joewood |
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| bascule | (noun) a structure or device in which one end is counterbalanced by the other (on the principle of the seesaw) | - |
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| basiscopic | (adjective) facing or on the side toward the base | - |
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| bathyscape | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscaph, bathyscaphe |
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| bathyscaph | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscape, bathyscaphe |
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| bathyscaphe | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscape, bathyscaph |
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| bioluminescence | (noun) luminescence produced by physiological processes (as in the firefly) | - |
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