| accelerometer | (noun) an instrument for measuring the acceleration of aircraft or rockets | - |
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| achromasia | (noun) unnatural lack of color in the skin (as from bruising or sickness or emotional distress) | Synonyms: lividity, lividness, luridness, paleness, pallidness, pallor, wanness |
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| achromatic | (adjective) having no hue | Synonyms: neutral |
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| achromaticity | (noun) the visual property of being without chromatic color | Synonyms: achromatism, colorlessness, colourlessness |
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| achromatin | (noun) the part of a cell nucleus that is relatively uncolored by stains or dyes | - |
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| achromatinic | (adjective) (of substance of a cell nucleus) not readily colored by stains | - |
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| achromatise | (verb) remove color from | Synonyms: achromatize |
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| achromatism | (noun) the visual property of being without chromatic color | Synonyms: achromaticity, colorlessness, colourlessness |
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| achromatize | (verb) remove color from | Synonyms: achromatise |
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| achromatous | (adjective) having little or inadequate color | - |
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| achromia | (noun) an absence of normal pigmentation especially in the skin (as in albinism) or in red blood cells | - |
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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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| acromegalia | (noun) enlargement of bones of hands and feet and face; often accompanied by headache and muscle pain and emotional disturbances; caused by overproduction of growth hormone by the anterior pituitary gland (due to a tumor) | Synonyms: acromegaly |
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| acromegalic | (adjective) marked or affected by enlargement or hypertrophy of the extremities or the face | - |
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| acromegaly | (noun) enlargement of bones of hands and feet and face; often accompanied by headache and muscle pain and emotional disturbances; caused by overproduction of growth hormone by the anterior pituitary gland (due to a tumor) | Synonyms: acromegalia |
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| acromicria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromikria |
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| acromikria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromicria |
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| acromion | (noun) the outermost point of the spine of the shoulder blade | Synonyms: acromial process |
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| acromphalus | (noun) abnormal protrusion of the navel; sometimes the start of umbilical hernia | - |
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| acromyotonia | (noun) myotonia of the extremities only; causes spastic deformity of the hand or foot | - |
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| aerodrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: airdrome, airport, drome |
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| aeromechanic | (adjective) of or pertaining to aerodynamics | - |
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| aeromechanics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aerodynamics |
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| aeromedical | (adjective) of or relating to aviation medicine | - |
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| aeromedicine | (noun) the study and treatment of disorders associated with flight (especially with space flight) | Synonyms: aerospace medicine, aviation medicine |
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| agromania | (noun) an intense desire to be alone or out in the open | - |
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| airdrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: aerodrome, airport, drome |
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| anadromous | (adjective) migrating from the sea to fresh water to spawn | - |
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| andromeda | (noun) any of several shrubs of the genus Andromeda having leathery leaves and clusters of small flowers | - |
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| (noun) broad-leaved evergreen Asiatic shrub with glossy leaves and drooping clusters of white flowers | Synonyms: Japanese andromeda, lily-of-the-valley tree, Pieris japonica |
| angstrom | (noun) a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation | Synonyms: A, angstrom unit |
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| antidromic | (adjective) conducting nerve impulses in a direction opposite to normal | - |
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| antiferromagnet | (noun) any material that has antiferromagnetic properties. | - |
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| antiferromagnetic | (adjective) relating to antiferromagnetism | - |
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| antiferromagnetism | (noun) magnetic field creates parallel but opposing spins; varies with temperature | - |
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| apochromatic | (adjective) corrected for both chromatic and spherical aberration | - |
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| aroma | (noun) any property detected by the olfactory system | Synonyms: odor, odour, olfactory property, scent, smell |
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| (noun) a distinctive odor that is pleasant | Synonyms: fragrance, perfume, scent |
| aromatherapy | (noun) the therapeutic use of aromatic plant extracts and essential oils in baths or massage | - |
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| aromatic | (adjective) (chemistry) of or relating to or containing one or more benzene rings | - |
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| (adjective) having a strong pleasant odor | Synonyms: redolent |
| aromaticity | (noun) The property of having an aroma. | - |
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| aromatise | (verb) fill or impregnate with an odor | Synonyms: aromatize, perfume |
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| aromatize | (verb) fill or impregnate with an odor | Synonyms: aromatise, perfume |
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| arthromere | (noun) any of the segments in the body of a jointed animal like an arthropod | - |
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| arthromeric | (adjective) of or relating to one of the body segments of jointed animals | - |
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| astrometry | (noun) the branch of astronomy that deals with the measurement of the position and motion of celestial bodies | - |
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| atheroma | (noun) a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow | - |
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| atheromatic | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatous |
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| atheromatous | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatic |
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| azithromycin | (noun) a systemic antibacterial medicine (trade name Zithromax) that is prescribed to treat bacterial infections in many different parts of the body | Synonyms: Zithromax |
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| barometer | (noun) an instrument that measures atmospheric pressure | - |
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| barometric | (adjective) relating to atmospheric pressure or indicated by a barometer | Synonyms: barometrical |
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| barometrical | (adjective) relating to atmospheric pressure or indicated by a barometer | Synonyms: barometric |
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| bichromate | (noun) a salt of the hypothetical dichromic acid | Synonyms: dichromate |
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| bichromated | (adjective) treated or combined with bichromate | - |
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| bichrome | (adjective) having two colors | Synonyms: bicolor, bicolored, bicolour, bicoloured, dichromatic |
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| bromance | (noun) non-sexual but intense relationship between two men | - |
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| bromate | (noun) a chemical compound that contains the bromate ion. | - |
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| (verb) treat with bromine | Synonyms: brominate |
| (verb) react with bromine | Synonyms: brominate |
| brome | (noun) any of various woodland and meadow grasses of the genus Bromus; native to temperate regions | Synonyms: bromegrass |
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| bromegrass | (noun) any of various woodland and meadow grasses of the genus Bromus; native to temperate regions | Synonyms: brome |
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| bromeosin | (noun) a red fluorescent dye resulting from the action of bromine on fluorescein; used in cosmetics and as a biological stain for studying cell structures | Synonyms: eosin |
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| bromic | (adjective) relating to or containing bromine (especially pentavalent bromine) | - |
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| bromide | (noun) a trite or obvious remark | Synonyms: banality, cliche, commonplace, platitude |
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| (noun) any of the salts of hydrobromic acid; formerly used as a sedative but now generally replaced by safer drugs | - |
| bromidic | (adjective) given to uttering bromides | - |
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| (adjective) dull and tiresome but with pretensions of significance or originality | Synonyms: corny, platitudinal, platitudinous |
| brominate | (verb) treat with bromine | Synonyms: bromate |
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| (verb) react with bromine | Synonyms: bromate |
| bromine | (noun) a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water | Synonyms: atomic number 35, Br |
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| bromoform | (noun) colorless liquid haloform CHBr3 | Synonyms: tribromomethane |
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| bromoil | (noun) a print made by the bromoil process having soft, paint-like qualities. | - |
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| carom | (noun) a shot in billiards in which the cue ball contacts one object ball and then the other | Synonyms: cannon |
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| (noun) a glancing rebound | Synonyms: ricochet |
| (verb) make a carom | - |
| (verb) rebound after hitting | - |
| catadromous | (adjective) migrating from fresh water to the sea to spawn | - |
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| centromere | (noun) a specialized condensed region of each chromosome that appears during mitosis where the chromatids are held together to form an X shape | Synonyms: kinetochore |
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| centromeric | (adjective) pertaining to the dense specialized portion of a chromosome to which the spindle attaches during mitosis | - |
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| cerebromeningitis | (noun) inflammation of the brain and spinal cord and their meninges | Synonyms: encephalomeningitis, meningoencephalitis |
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| chiromance | (verb) divine by reading someone's palms | - |
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| chiromancer | (noun) fortuneteller who predicts your future by the lines on your palms | Synonyms: palmist, palmister |
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| chiromancy | (noun) telling fortunes by lines on the palm of the hand | Synonyms: chirology, palm reading, palmistry |
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| chiromantic | (adjective) of or relating to palmistry | - |
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| chlorpromazine | (noun) a drug (trade name Thorazine) derived from phenothiazine that has antipsychotic effects and is used as a sedative and tranquilizer | Synonyms: Thorazine |
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| chondroma | (noun) a common benign tumor of cartilage cells | - |
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| chroma | (noun) chromatic purity: freedom from dilution with white and hence vivid in hue | Synonyms: intensity, saturation, vividness |
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| chromaesthesia | (noun) a form of synesthesia in which nonvisual stimulation results in the experience of color sensations | Synonyms: chromesthesia |
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| chromate | (noun) any salt or ester of chromic acid | - |
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| chromatic | (adjective) being or having or characterized by hue | - |
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| (adjective) based on a scale consisting of 12 semitones | - |
| (adjective) able to refract light without spectral color separation | - |
| chromatically | (adverb) with respect to color | - |
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| chromaticity | (noun) the quality of a color as determined by its dominant wavelength | Synonyms: hue |
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| chromatid | (noun) one of two identical strands into which a chromosome splits during mitosis | - |
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| chromatin | (noun) the readily stainable substance of a cell nucleus consisting of DNA and RNA and various proteins; during mitotic division it condenses into chromosomes | Synonyms: chromatin granule |
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| chromatinic | (adjective) (of substance of a cell nucleus) readily colored by stains | - |
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| chromatism | (noun) abnormal pigmentation | - |
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| (noun) hallucinatory perception of colored lights | - |
| chromatogram | (noun) the recording (column or paper strip) on which the constituents of a mixture are adsorbed in chromatography | - |
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| chromatograph | (noun) equipment that enables a sophisticated separation, e.g. gas chromatographic or liquid chromatographic separation. | - |
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| chromatographic | (adjective) of or relating to chromatography | Synonyms: chromatographical |
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| chromatographical | (adjective) of or relating to chromatography | Synonyms: chromatographic |
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| chromatographically | (adverb) by means of a chromatographic process | - |
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| chromatography | (noun) a process used for separating mixtures by virtue of differences in absorbency | - |
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| chrome | (noun) another word for chromium when it is used in dyes or pigments | - |
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| (verb) treat with a chromium compound | - |
| (verb) plate with chromium | Synonyms: chromium-plate |
| chromesthesia | (noun) a form of synesthesia in which nonvisual stimulation results in the experience of color sensations | Synonyms: chromaesthesia |
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| chromite | (noun) a brownish-black mineral; the major source of chromium | - |
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| chromium | (noun) a hard brittle multivalent metallic element; resistant to corrosion and tarnishing | Synonyms: atomic number 24, Cr |
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| chromoblastomycosis | (noun) a fungal infection characterized by itchy warty nodules on the skin | - |
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| chromogen | (noun) a compound that can be converted to a pigment | - |
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