| abacus | (noun) a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves | - |
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| (noun) a tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave | - |
| abdominousness | (noun) the bodily property of a protruding belly | Synonyms: paunchiness |
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| abecedarius | (noun) a poem having lines beginning with letters of the alphabet in regular order | - |
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| abocclusion | (noun) the condition in which the upper teeth do not touch the lower teeth when biting | - |
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| abortus | (noun) a human fetus whose weight is less than 0.5 kilogram when removed or expelled from the mother's body | - |
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| abstemiousness | (noun) moderation in eating and drinking | - |
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| (noun) restricted to bare necessities | - |
| abstruseness | (noun) the quality of being unclear or abstruse and hard to understand | Synonyms: obscureness, obscurity, reconditeness |
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| (noun) wisdom that is recondite and abstruse and profound | Synonyms: abstrusity, profoundness, profundity, reconditeness |
| abstrusity | (noun) wisdom that is recondite and abstruse and profound | Synonyms: abstruseness, profoundness, profundity, reconditeness |
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| abuse | (noun) improper or excessive use | Synonyms: misuse |
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| (noun) cruel or inhumane treatment | Synonyms: ill-treatment, ill-usage, maltreatment |
| (noun) a rude expression intended to offend or hurt | Synonyms: contumely, insult, revilement, vilification |
| abuser | (noun) someone who abuses | Synonyms: maltreater |
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| acanthus | (noun) any plant of the genus Acanthus having large spiny leaves and spikes or white or purplish flowers; native to Mediterranean region but widely cultivated | - |
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| acarus | (noun) any of several mites of the order Acarina | Synonyms: genus Acarus |
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| accoucheuse | (noun) a woman skilled in aiding the delivery of babies | Synonyms: midwife |
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| accusal | (noun) a formal charge of wrongdoing brought against a person; the act of imputing blame or guilt | Synonyms: accusation |
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| accusation | (noun) a formal charge of wrongdoing brought against a person; the act of imputing blame or guilt | Synonyms: accusal |
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| (noun) an assertion that someone is guilty of a fault or offence | Synonyms: charge |
| accusative | (noun) the case of nouns serving as the direct object of a verb | Synonyms: accusative case, objective case |
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| accused | (noun) a defendant in a criminal proceeding | - |
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| accuser | (noun) someone who imputes guilt or blame | - |
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| acervulus | (noun) small asexual fruiting body resembling a cushion or blister consisting of a mat of hyphae that is produced on a host by some fungi | - |
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| acidophilus | (noun) a bacterium that is used to make yogurt and to supplement probiotics | Synonyms: Lactobacillus acidophilus |
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| acidulousness | (noun) the taste experience when something acidic is taken into the mouth | Synonyms: acidity |
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| acinus | (noun) one of the small sacs or saclike dilations in a compound gland | - |
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| (noun) one of the small drupes making up an aggregate or multiple fruit like a blackberry | - |
| acousma | (noun) illusory auditory perception of strange nonverbal sounds | Synonyms: auditory hallucination |
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| acoustic | (noun) a remedy for hearing loss or deafness | - |
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| acoustician | (noun) a physicist who specializes in acoustics | - |
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| acousticophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: phonophobia |
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| acoustics | (noun) the study of the physical properties of sound | - |
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| acromphalus | (noun) abnormal protrusion of the navel; sometimes the start of umbilical hernia | - |
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| aculeus | (noun) a sharp-pointed process especially a sting of a hymenopterous insect | - |
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| (noun) a stiff sharp-pointed plant process | - |
| adenovirus | (noun) any of a group of viruses including those that in humans cause upper respiratory infections or infectious pinkeye | - |
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| adjuster | (noun) one who investigates insurance claims or claims for damages and recommends an effective settlement | Synonyms: adjustor, claim agent, claims adjuster, claims adjustor |
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| adjustment | (noun) the act of making something different (as e.g. the size of a garment) | Synonyms: alteration, modification |
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| (noun) the act of adjusting something to match a standard | Synonyms: readjustment, registration |
| (noun) making or becoming suitable; adjusting to circumstances | Synonyms: accommodation, fitting |
| (noun) an amount added or deducted on the basis of qualifying circumstances | Synonyms: allowance |
| (noun) the process of adapting to something (such as environmental conditions) | Synonyms: adaptation, adaption |
| adjustor | (noun) one who investigates insurance claims or claims for damages and recommends an effective settlement | Synonyms: adjuster, claim agent, claims adjuster, claims adjustor |
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| adulterousness | (noun) The quality of being adulterous, involving sexual intercourse by a married person with someone other than their spouse. | - |
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| advantageousness | (noun) the quality of being encouraging or promising of a successful outcome | Synonyms: favorableness, favourableness, positiveness, positivity, profitableness |
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| adventurousness | (noun) the trait of being adventurous | Synonyms: venturesomeness |
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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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| afflatus | (noun) a strong creative impulse; divine inspiration | - |
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| affusion | (noun) the act of baptizing someone by pouring water on their head | - |
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| agapanthus | (noun) any of various plants of the genus Agapanthus having umbels of showy blue to purple flowers | Synonyms: lily of the Nile |
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| agribusiness | (noun) a large-scale farming enterprise | Synonyms: agriculture, factory farm |
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| ailanthus | (noun) any of several deciduous Asian trees of the genus Ailanthus | - |
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| airbrush | (noun) an atomizer to spray paint by means of compressed air | - |
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| airbus | (noun) a subsonic jet airliner operated over short distances | - |
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| alehouse | (noun) a tavern where ale is sold | - |
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| allosaurus | (noun) late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus | Synonyms: allosaur |
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| allusion | (noun) passing reference or indirect mention | - |
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| allusiveness | (noun) a quality characterized by indirect reference | - |
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| alphavirus | (noun) an arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses | - |
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| altocumulus | (noun) a cumulus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altocumulus cloud |
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| altostratus | (noun) a stratus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altostratus cloud |
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| alumnus | (noun) a male person who has received a degree from a school (high school or college or university) | - |
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| alveolus | (noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways | Synonyms: air cell, air sac |
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| (noun) a bony socket in the alveolar ridge that holds a tooth | Synonyms: tooth socket |
| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
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| ambitiousness | (noun) a strong drive for success | Synonyms: ambition |
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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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| ambush | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambuscade, lying in wait, trap |
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| ambusher | (noun) an attacker who waits in a concealed position to launch a surprise attack | - |
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| amorousness | (noun) a feeling of love or fondness | Synonyms: enamoredness |
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| (noun) the arousal of feelings of sexual desire | Synonyms: amativeness, eroticism, erotism, sexiness |
| amorphophallus | (noun) any plant of the genus Amorphophallus | - |
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| amphioxus | (noun) small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates | Synonyms: lancelet |
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| amusement | (noun) an activity that is diverting and that holds the attention | Synonyms: entertainment |
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| (noun) a feeling of delight at being entertained | - |
| anchusa | (noun) any of various Old World herbs of the genus Anchusa having one-sided clusters of trumpet-shaped flowers | - |
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| anestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anoestrum, anoestrus |
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| angelus | (noun) the sound of a bell rung in Roman Catholic churches to announce the time when the Angelus should be recited | Synonyms: angelus bell |
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| animus | (noun) a feeling of ill will arousing active hostility | Synonyms: animosity, bad blood |
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| ankus | (noun) an elephant goad with a sharp spike and a hook | - |
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| ankylosaurus | (noun) having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's | Synonyms: ankylosaur |
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| annulus | (noun) (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar | Synonyms: skirt |
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| (noun) a toroidal shape | Synonyms: anchor ring, doughnut, halo, ring |
| anoestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrum |
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| anomalousness | (noun) deviation from the normal or common order or form or rule | Synonyms: anomaly |
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| anthropophagus | (noun) a person who eats human flesh | Synonyms: anthropophagite, cannibal, man-eater |
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| antireligiousness | (noun) The state or condition of being opposed to religion. | - |
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| antitussive | (noun) any medicine used to suppress or relieve coughing | - |
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| anus | (noun) the excretory opening at the end of the alimentary canal | - |
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| anxiousness | (noun) a feeling of mild anxiety about possible developments | Synonyms: disquiet |
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| (noun) (psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic | Synonyms: anxiety |
| apatosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| apparatus | (noun) equipment designed to serve a specific function | Synonyms: setup |
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| (noun) (anatomy) a group of body parts that work together to perform a given function | - |
| applause | (noun) a demonstration of approval by clapping the hands together | Synonyms: clapping, hand clapping |
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| arborvirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arbovirus |
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| arbovirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arborvirus |
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| arbutus | (noun) any of several evergreen shrubs of the genus Arbutus of temperate Europe and America | - |
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| arcus | (noun) a whitish deposit in the shape of an arc that is sometimes seen in the cornea | Synonyms: arcus senilis |
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| arduousness | (noun) extreme effortfulness | Synonyms: strenuousness |
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| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| arethusa | (noun) any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers | - |
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| argus | (noun) large brilliantly patterned East Indian pheasant | Synonyms: argus pheasant |
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| arousal | (noun) the act of arousing | Synonyms: rousing |
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| (noun) mutual sexual fondling prior to sexual intercourse | Synonyms: foreplay, stimulation |
| (noun) awakening from sleep | - |
| (noun) a state of heightened physiological activity | - |
| arouser | (noun) someone who rouses others from sleep | Synonyms: rouser, waker |
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| arquebus | (noun) an obsolete firearm with a long barrel | Synonyms: hackbut, hagbut, harquebus |
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| ascus | (noun) saclike structure in which ascospores are formed through sexual reproduction of ascomycetes | - |
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| asparagus | (noun) edible young shoots of the asparagus plant | - |
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| (noun) plant whose succulent young shoots are cooked and eaten as a vegetable | Synonyms: Asparagus officinales, edible asparagus |
| assiduousness | (noun) great and constant diligence and attention | Synonyms: assiduity, concentration |
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| astragalus | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragal, talus |
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| atrociousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrocity, barbarity, barbarousness, heinousness |
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| audaciousness | (noun) fearless daring | Synonyms: audacity, temerity |
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| (noun) aggressive boldness or unmitigated effrontery | Synonyms: audacity |
| auscultation | (noun) listening to sounds within the body (usually with a stethoscope) | - |
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| auspex | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: augur |
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| auspice | (noun) a favorable omen | - |
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| auspices | (noun) kindly endorsement and guidance | Synonyms: aegis, protection |
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