| ablepharia | (noun) a congenital absence of eyelids (partial or complete) | - |
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| abolishable | (adjective) capable of being abolished | - |
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| acantha | (noun) any sharply pointed projection | Synonyms: spine, spur |
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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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| 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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| accomplishable | (adjective) capable of existing or taking place or proving true; possible to do | Synonyms: achievable, doable, manageable, realizable |
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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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| 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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| 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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| aerophagia | (noun) swallowing air (usually followed by belching and discomfort and flatulence) | - |
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| afghan | (noun) a blanket knitted or crocheted in strips or squares; sometimes used as a shawl | - |
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| (noun) a coat made of sheepskin | Synonyms: sheepskin coat |
| afghani | (noun) the basic unit of money in Afghanistan | - |
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| aftershaft | (noun) a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds | - |
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| aftershafted | (adjective) having an aftershaft (a small feather at the base of some feathers) | - |
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| aghast | (adjective) struck with fear, dread, or consternation | Synonyms: appalled, dismayed, shocked |
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| agnathan | (noun) eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms | Synonyms: jawless fish, jawless vertebrate |
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| agrapha | (noun) sayings of Jesus not recorded in the canonical Gospels | - |
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| alhamdulilah | (noun) An expression meaning 'praise God' in Arabic | - |
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| aliphatic | (adjective) having carbon atoms linked in open chains | - |
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| aloha | (noun) an acknowledgment that can be used to say hello or goodbye (aloha is Hawaiian and ciao is Italian) | Synonyms: ciao |
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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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| althaea | (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althea, hollyhock |
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| aminomethane | (noun) a methyl with the hydrogen atom replaced by an amino radical | - |
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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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| analphabet | (noun) an illiterate person who does not know the alphabet | Synonyms: analphabetic |
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| analphabetic | (adjective) not alphabetic | - |
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| (adjective) relating to or expressed by a writing system that is not alphabetic | - |
| (adjective) having little acquaintance with writing | Synonyms: unlettered |
| (noun) an illiterate person who does not know the alphabet | Synonyms: analphabet |
| analphabetism | (noun) an inability to read | Synonyms: illiteracy |
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| anaphase | (noun) the stage of meiosis or mitosis when chromosomes move toward opposite ends of the nuclear spindle | - |
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| anaphasic | (adjective) of or related to the stage of mitosis known as anaphase | - |
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| anencephalia | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephaly |
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| anencephalic | (adjective) characterized by partial or total absence of a brain | Synonyms: anencephalous |
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| anencephalous | (adjective) characterized by partial or total absence of a brain | Synonyms: anencephalic |
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| anencephaly | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephalia |
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| antechamber | (noun) a large entrance or reception room or area | Synonyms: anteroom, entrance hall, foyer, hall, lobby, vestibule |
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| anthophagous | (adjective) feeding on flowers | Synonyms: anthophilous |
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| anthropophagite | (noun) a person who eats human flesh | Synonyms: anthropophagus, cannibal, man-eater |
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| anthropophagous | (adjective) of or relating to eaters of human flesh | - |
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| anthropophagus | (noun) a person who eats human flesh | Synonyms: anthropophagite, cannibal, man-eater |
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| anthropophagy | (noun) human cannibalism; the eating of human flesh | - |
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| aphaeresis | (noun) (linguistics) omission at the beginning of a word as in `coon' for `raccoon' or `till' for `until' | Synonyms: apheresis |
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| aphaeretic | (adjective) relating to or formed by or consisting of aphaeresis | Synonyms: apheretic |
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| aphagia | (noun) loss of the ability to swallow | - |
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| aphakia | (noun) absence of the natural lens of the eye (usually resulting from the removal of cataracts) | - |
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| aphakic | (adjective) of or relating to or afflicted with aphakia | - |
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| (noun) someone afflicted by aphakia; someone lacking the natural lenses of the eyes | - |
| aphanite | (noun) fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye | - |
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| aphanitic | (adjective) of or relating to aphanite | - |
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| aphasia | (noun) inability to use or understand language (spoken or written) because of a brain lesion | - |
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| aphasic | (adjective) related to or affected by aphasia | - |
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| (adjective) unable to speak because of a brain lesion | - |
| (noun) someone affected by aphasia or inability to use or understand language | - |
| apishamore | (noun) a saddle blanket made of buffalo hide | - |
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| apocryphal | (adjective) being of questionable authenticity | - |
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| apocryphalness | (noun) The property of being of doubtful authenticity, of lacking authority, or of not being regarded as canonical. | - |
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| (noun) The property of being of dubious veracity; of questionable accuracy or truthfulness. | - |
| apophasis | (noun) mentioning something by saying it will not be mentioned | - |
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| apophatic | (adjective) of or relating to the belief that God can be known to humans only in terms of what He is not (such as `God is unknowable') | - |
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| apophatism | (noun) the religious belief that God cannot be known but is completely `other' and must be described in negative terms (in terms of what God is not) | - |
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| approachability | (noun) the attribute of being easy to meet or deal with | Synonyms: accessibility |
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| approachable | (adjective) easy to meet or converse or do business with | - |
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| (adjective) easily approached | Synonyms: reachable |
| (adjective) capable of being read with comprehension | Synonyms: accessible |
| archaean | (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon | Synonyms: archean |
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| archaebacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacterium, archaeobacteria, archeobacteria |
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| archaebacterium | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaeobacteria, archeobacteria |
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| archaeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archeobacteria |
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| archaeologic | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeological, archeologic, archeological |
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| archaeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archeologic, archeological |
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| archaeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archeologist |
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| archaeology | (noun) the branch of anthropology that studies prehistoric people and their cultures | Synonyms: archeology |
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| archaeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: Archaeopteryx lithographica, archeopteryx |
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| archaeornis | (noun) extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing | - |
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| archaeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archeozoic |
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| archaic | (adjective) little evolved from or characteristic of an earlier ancestral type | Synonyms: primitive |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antediluvian, antiquated |
| archaicism | (noun) the use of an archaic expression | Synonyms: archaism |
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| archaise | (verb) give an archaic appearance of character to | Synonyms: archaize |
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| archaism | (noun) the use of an archaic expression | Synonyms: archaicism |
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| archaist | (noun) an expert or collector of antiquities | Synonyms: antiquarian, antiquary |
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| (noun) a person who archaizes | - |
| archaistic | (adjective) imitative of an archaic style or manner | - |
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| archaize | (verb) give an archaic appearance of character to | Synonyms: archaise |
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| archangel | (noun) an angel ranked above the highest rank in the celestial hierarchy | - |
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| (noun) a biennial cultivated herb; its stems are candied and eaten and its roots are used medicinally | Synonyms: Angelica Archangelica, garden angelica |
| archangelic | (adjective) of or relating to or resembling archangels | Synonyms: archangelical |
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