| abiotrophy | (noun) a loss of vitality and a degeneration of cells and tissues not due to any apparent injury | - |
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| ablepharia | (noun) a congenital absence of eyelids (partial or complete) | - |
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| acanthocephalan | (noun) any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines | Synonyms: spiny-headed worm |
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| acarophobia | (noun) a morbid fear of small insects and mites and worms | - |
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| acataphasia | (noun) a disorder in which a lesion to the central nervous system leaves you unable to formulate a statement or to express yourself in an organized manner | - |
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| acephalia | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalism, acephaly |
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| acephalism | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephaly |
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| acephalous | (adjective) lacking a head or a clearly defined head | - |
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| acephaly | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephalism |
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| acetaminophen | (noun) an analgesic for mild pain but not for inflammation; also used as an antipyretic; (Datril, Tylenol, Panadol, Phenaphen, Tempra, and Anacin III are trademarks of brands of acetaminophen tablets) | Synonyms: Anacin III, Datril, Panadol, Phenaphen, Tempra, Tylenol |
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| acetophenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetphenetidin, phenacetin |
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| acetphenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetophenetidin, phenacetin |
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| acidophil | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophile |
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| acidophile | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophil |
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| acidophilic | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilous, aciduric |
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| acidophilous | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, aciduric |
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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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| acousticophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: phonophobia |
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| acrocephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: oxycephaly |
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| acromphalus | (noun) abnormal protrusion of the navel; sometimes the start of umbilical hernia | - |
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| acrophobia | (noun) a morbid fear of great heights | - |
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| acrophobic | (adjective) suffering from acrophobia; abnormally afraid of high places | - |
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| acrophony | (noun) naming a letter of the alphabet by using a word whose initial sound is the sound represented by that letter | - |
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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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| adenohypophysis | (noun) the anterior lobe of the pituitary body; primarily glandular in nature | Synonyms: anterior pituitary, anterior pituitary gland |
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| adiaphoron | (noun) (Stoic philosophy) a matter having no moral merit or demerit. | - |
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| (noun) a religious ceremonial or ritual observance that is held to be an affair of the individual conscience because it is neither forbidden nor enjoined by the scriptures. | - |
| adoxography | (noun) fine writing in praise of trivial or base subjects | - |
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| adrenocorticotrophic | (adjective) stimulating or acting on the adrenal cortex | Synonyms: adrenocorticotropic |
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| adrenocorticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin, corticotropin |
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| aerophagia | (noun) swallowing air (usually followed by belching and discomfort and flatulence) | - |
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| aerophilatelic | (adjective) of or relating to airmail stamps | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aerophile | (noun) a lover of aviation | - |
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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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| aerophyte | (noun) plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it | Synonyms: air plant, epiphyte, epiphytic plant |
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| agoraphobia | (noun) a morbid fear of open spaces (as fear of being caught alone in some public place) | - |
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| agoraphobic | (adjective) suffering from agoraphobia; abnormally afraid of open or public places | - |
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| agrapha | (noun) sayings of Jesus not recorded in the canonical Gospels | - |
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| agraphia | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: anorthography, logagraphia |
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| agraphic | (adjective) relating to or having agraphia | - |
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| agraphon | (noun) (usually plural) a saying of Jesus not in the canonical gospels but found in other New Testament or early Christian writings. | - |
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| ailurophobia | (noun) a morbid fear of cats | - |
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| aleph | (noun) the 1st letter of the Hebrew alphabet | - |
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| algophilia | (noun) sexual pleasure derived from inflicting or experiencing pain | Synonyms: algolagnia |
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| algophobia | (noun) a morbid fear of pain | - |
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| algophobic | (adjective) suffering from algophobia; abnormally afraid of pain | - |
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| aliphatic | (adjective) having carbon atoms linked in open chains | - |
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| allelomorph | (noun) (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character | Synonyms: allele |
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| allelomorphic | (adjective) of or relating to alleles | Synonyms: allelic |
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| allograph | (noun) a variant form of a grapheme, as `m' or `M' or a handwritten version of that grapheme | - |
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| (noun) a signature written by one person for another | - |
| allographic | (adjective) of or relating to an allograph | - |
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| allomorph | (noun) a variant phonological representation of a morpheme | - |
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| (noun) any of several different crystalline forms of the same chemical compound | - |
| allomorphic | (adjective) pertaining to allomorphs | - |
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| allophone | (noun) (linguistics) any of various acoustically different forms of the same phoneme | - |
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| allophonic | (adjective) pertaining to allophones | - |
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| alpha | (adjective) early testing stage of a software or hardware product | - |
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| (adjective) first in order of importance | - |
| (noun) the 1st letter of the Greek alphabet | - |
| (noun) the beginning of a series or sequence | - |
| alphabet | (noun) the elementary stages of any subject (usually plural) | Synonyms: first principles, rudiments |
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| (noun) a character set that includes letters and is used to write a language | Synonyms: ABC's, ABC, ABCs |
| alphabetic | (adjective) arranged in order according to the alphabet | Synonyms: alphabetical |
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| (adjective) relating to or expressed by a writing system that uses an alphabet | Synonyms: alphabetical |
| alphabetical | (adjective) arranged in order according to the alphabet | Synonyms: alphabetic |
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| (adjective) relating to or expressed by a writing system that uses an alphabet | Synonyms: alphabetic |
| alphabetically | (adverb) in alphabetical order | - |
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| alphabetisation | (noun) the act of putting in alphabetical order | Synonyms: alphabetization |
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| alphabetise | (verb) arrange in alphabetical order | Synonyms: alphabetize |
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| alphabetised | (adjective) having been put in alphabetical order | Synonyms: alphabetized |
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| alphabetiser | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetizer |
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| alphabetization | (noun) the act of putting in alphabetical order | Synonyms: alphabetisation |
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| alphabetize | (verb) arrange in alphabetical order | Synonyms: alphabetise |
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| (verb) provide with an alphabet | - |
| alphabetized | (adjective) having been put in alphabetical order | Synonyms: alphabetised |
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| alphabetizer | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetiser |
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| alphameric | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphamerical, alphanumeric, alphanumerical |
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| alphamerical | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphameric, alphanumeric, alphanumerical |
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| alphanumeric | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphameric, alphamerical, alphanumerical |
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| alphanumerical | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphameric, alphamerical, alphanumeric |
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| alphanumerics | (noun) a character set that includes letters and digits and punctuation | Synonyms: alphanumeric characters |
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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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| aminopherase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminotransferase, transaminase |
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| aminophylline | (noun) a theophylline derivative that is used as a bronchodilator in the treatment of bronchial asthma, emphysema, and bronchitis | - |
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| amorpha | (noun) any plant of the genus Amorpha having odd-pinnate leaves and purplish spicate flowers | - |
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| amorphophallus | (noun) any plant of the genus Amorphophallus | - |
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| amorphous | (adjective) lacking the system or structure characteristic of living bodies | Synonyms: unstructured |
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| (adjective) without real or apparent crystalline form | Synonyms: uncrystallised, uncrystallized |
| (adjective) unclear because vague or badly organized | - |
| (adjective) having no definite form or distinct shape | Synonyms: formless, shapeless |
| (adjective) (of a group of people or an organization) unorganized or unfocused | - |
| amphetamine | (noun) a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression | Synonyms: pep pill, speed, upper |
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| amphibia | (noun) the class of vertebrates that live on land but breed in water, frogs, toads, newts, salamanders, caecilians | Synonyms: class Amphibia |
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| amphibian | (adjective) relating to or characteristic of animals of the class Amphibia | Synonyms: amphibious |
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| (noun) cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form | - |
| (noun) an airplane designed to take off and land on water | Synonyms: amphibious aircraft |
| (noun) a flat-bottomed motor vehicle that can travel on land or water | Synonyms: amphibious vehicle |
| amphibiotic | (adjective) having an aquatic early or larval form and a terrestrial adult form | Synonyms: semiaquatic |
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| amphibious | (adjective) operating or living on land and in water | - |
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| (adjective) relating to or characteristic of animals of the class Amphibia | Synonyms: amphibian |
| amphibole | (noun) a mineral or mineral variety belonging to the amphibole group | - |
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| amphibolite | (noun) a metamorphic rock composed chiefly of amphibole and plagioclase | - |
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| amphibology | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphiboly |
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| amphiboly | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphibology |
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| amphibrach | (noun) a metrical unit with unstressed-stressed-unstressed syllables (e.g., `remember') | - |
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| amphictyony | (noun) an association of neighboring states or tribes in ancient Greece; established originally to defend a common religious center | - |
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| amphidiploid | (noun) (genetics) an organism or cell having a diploid set of chromosomes from each parent | - |
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| amphidiploidy | (noun) the condition of being amphidiploid | - |
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| amphigory | (noun) nonsensical writing (usually verse) | Synonyms: nonsense verse |
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| amphimixis | (noun) union of sperm and egg in sexual reproduction | - |
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| (noun) reproduction involving the union or fusion of a male and a female gamete | Synonyms: sexual reproduction |
| amphioxus | (noun) small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates | Synonyms: lancelet |
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| amphipod | (noun) a kind of malacostracan crustacean | - |
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| 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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