| achlamydeous | (adjective) not having a floral envelope or perianth | - |
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| advantageous | (adjective) giving an advantage | Synonyms: favorable, favourable |
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| (adjective) appropriate for achieving a particular end; implies a lack of concern for fairness | - |
| advantageously | (adverb) in a manner affording benefit or advantage | Synonyms: well |
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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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| aeolotropic | (adjective) having properties with different values along different axes | Synonyms: eolotropic |
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| aeon | (noun) (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe | Synonyms: eon |
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| (noun) an immeasurably long period of time | Synonyms: eon |
| (noun) the longest division of geological time | Synonyms: eon |
| aeonian | (adjective) of or relating to a geological eon (longer than an era) | Synonyms: eonian |
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| (adjective) continuing forever or indefinitely | Synonyms: ageless, eonian, eternal, everlasting, perpetual, unceasing, unending |
| alliaceous | (adjective) of or pertaining to the botanical genus Allium | - |
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| (adjective) smelling of onions or garlic | - |
| alveolar | (adjective) pertaining to the tiny air sacs of the lungs | - |
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| (adjective) pertaining to the sockets of the teeth or that part of the upper jaw | - |
| (noun) a consonant articulated with the tip of the tongue near the gum ridge | Synonyms: alveolar consonant, dental, dental consonant |
| alveolate | (adjective) pitted with cell-like cavities (as a honeycomb) | Synonyms: cavitied, faveolate, honeycombed, pitted |
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| alveolitis | (noun) inflammation of the alveoli in the lungs caused by inhaling dust; with repeated exposure the condition may become chronic | - |
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| (noun) inflammation in the socket of a tooth; sometimes occurs after a tooth is extracted and a blood clot fails to form | Synonyms: dry socket |
| 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 |
| amentaceous | (adjective) (of plants) bearing or characterized by aments or catkins | Synonyms: amentiferous |
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| amylaceous | (adjective) resembling starch | Synonyms: amyloid, amyloidal, farinaceous, starchlike |
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| antineoplastic | (adjective) used in the treatment of cancer | Synonyms: anticancer, antitumor, antitumour |
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| (noun) any of several drugs that control or kill neoplastic cells; used in chemotherapy to kill cancer cells; all have unpleasant side effects that may include nausea and vomiting and hair loss and suppression of bone marrow function | Synonyms: antineoplastic drug, cancer drug |
| apocynaceous | (adjective) of or relating to tropical plants of the family Apocynaceae | - |
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| apotheose | (verb) deify or glorify | Synonyms: apotheosise, apotheosize |
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| apotheosis | (noun) the elevation of a person (as to the status of a god) | Synonyms: deification, exaltation |
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| (noun) model of excellence or perfection of a kind; one having no equal | Synonyms: ideal, nonesuch, nonpareil, nonsuch, paragon, saint |
| apotheosise | (verb) deify or glorify | Synonyms: apotheose, apotheosize |
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| apotheosize | (verb) deify or glorify | Synonyms: apotheose, apotheosise |
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| aqueous | (adjective) produced by the action of water | Synonyms: sedimentary |
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| (adjective) similar to or containing or dissolved in water | - |
| araceous | (adjective) relating to a plant of the family Araceae | Synonyms: aroid |
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| arboraceous | (adjective) abounding in trees | Synonyms: arboreous, woodsy, woody |
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| arboreous | (adjective) inhabiting or frequenting trees | Synonyms: arboreal, tree-living |
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| (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
| (adjective) abounding in trees | Synonyms: arboraceous, woodsy, woody |
| 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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| archeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archaeobacteria |
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| archeologic | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archaeological, archeological |
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| archeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archaeological, archeologic |
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| archeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archaeologist |
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| archeology | (noun) the branch of anthropology that studies prehistoric people and their cultures | Synonyms: archaeology |
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| archeopteryx | (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, Archaeopteryx lithographica |
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| archeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archaeozoic |
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| arenaceous | (adjective) resembling or containing or abounding in sand; or growing in sandy areas | Synonyms: sandlike, sandy |
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| areola | (noun) small circular area such as that around the human nipple or an inflamed area around a pimple or insect bite | Synonyms: ring of color |
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| (noun) small space in a tissue or body part such as the area between veins on a leaf or an insect's wing | - |
| areolar | (adjective) relating to or like or divided into areolae | Synonyms: areolate |
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| areolate | (adjective) relating to or like or divided into areolae | Synonyms: areolar |
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| argillaceous | (adjective) resembling or containing clay | Synonyms: clayey |
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| arundinaceous | (adjective) of or relating to or resembling reedlike plants of the genus Arundinaria | - |
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| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| astereognosis | (noun) a loss of the ability to recognize objects by handling them | Synonyms: tactile agnosia |
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| aureole | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aura, gloriole, glory, halo, nimbus |
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| (noun) the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse | Synonyms: corona |
| autostereotype | (noun) the standardized mental picture held in common by members of a cultural group depicting an oversimplified image of themselves and their behaviour. | - |
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| aztreonam | (noun) an antibiotic (trade name Azactam) used against severe infections; has minimal side effects | Synonyms: Azactam |
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| bandoneon | (noun) a type of concertina popular in South America | - |
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| beauteous | (adjective) (poetic) beautiful, especially to the sight | - |
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| beauteousness | (noun) the quality of being good looking and attractive | Synonyms: comeliness, fairness, loveliness |
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| betulaceous | (adjective) of or pertaining to or characteristic of trees of the birch family | - |
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| bignoniaceous | (adjective) of or pertaining to or characteristic of plants of the family Bignoniaceae | - |
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| biogeographic | (adjective) of or relating to or involved with biogeography | Synonyms: biogeographical |
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| biogeographical | (adjective) of or relating to or involved with biogeography | Synonyms: biogeographic |
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| biogeography | (noun) dealing with the geographical distribution of animals and plants | - |
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| bludgeon | (noun) a club used as a weapon | - |
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| (verb) strike with a club or a bludgeon | Synonyms: club |
| (verb) overcome or coerce as if by using a heavy club | - |
| bludgeoner | (noun) an assailant who uses a bludgeon | - |
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| bounteous | (adjective) given or giving freely | Synonyms: big, bighearted, bountiful, freehanded, giving, handsome, liberal, openhanded |
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| bounteously | (adverb) in a bountiful manner | Synonyms: bountifully, plenteously, plentifully |
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| bounteousness | (noun) (literary) generosity evidenced by a willingness to give freely | Synonyms: bounty |
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| bourgeois | (adjective) (according to Marxist thought) being of the property-owning class and exploitive of the working class | - |
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| (adjective) belonging to the middle class | - |
| (adjective) conforming to the standards and conventions of the middle class | Synonyms: conservative, materialistic |
| (noun) a member of the middle class | Synonyms: burgher |
| (noun) a capitalist who engages in industrial commercial enterprise | Synonyms: businessperson |
| bourgeoisie | (noun) the social class between the lower and upper classes | Synonyms: middle class |
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| bourgeon | (verb) produce buds, branches, or germinate | Synonyms: burgeon forth, germinate, pullulate, shoot, sprout, spud |
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| bracteolate | (adjective) having bracteoles | - |
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| bracteole | (noun) a small bract | Synonyms: bractlet |
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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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| bulbaceous | (adjective) producing or growing from bulbs | - |
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| burgeon | (verb) grow and flourish | - |
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| burgeoning | (adjective) very lively and profitable | Synonyms: booming, flourishing, palmy, prospering, prosperous, roaring, thriving |
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| businesspeople | (noun) people who transact business (especially business executives) | Synonyms: business people |
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| buteonine | (adjective) relating to or resembling a hawk of the genus Buteo | - |
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| (noun) any hawk of the genus Buteo | - |
| butyraceous | (adjective) having the qualities of butter or yielding or containing a substance like butter | - |
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| calcareous | (adjective) composed of or containing or resembling calcium carbonate or calcite or chalk | Synonyms: chalky |
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| calceolaria | (noun) any garden plant of the genus Calceolaria having flowers with large inflated slipper-shaped lower lip | Synonyms: slipperwort |
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| calceolate | (adjective) of slipper-shaped blossoms | Synonyms: calceiform |
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| cameo | (noun) engraving or carving in low relief on a stone (as in a brooch or ring) | - |
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| camphoraceous | (adjective) being or having the properties of camphor | - |
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| carbonaceous | (adjective) relating to or consisting of or yielding carbon | Synonyms: carbonic, carboniferous, carbonous |
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| caryophyllaceous | (adjective) of or pertaining to plants of the family Caryophyllaceae | - |
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| caseous | (adjective) of damaged or necrotic tissue; cheeselike | - |
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| cetaceous | (adjective) of or relating to whales and dolphins etc | Synonyms: cetacean |
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| chamaeleon | (noun) lizard of Africa and Madagascar able to change skin color and having a projectile tongue | Synonyms: chameleon |
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| chameleon | (noun) lizard of Africa and Madagascar able to change skin color and having a projectile tongue | Synonyms: chamaeleon |
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| (noun) a changeable or inconstant person | - |
| changeover | (noun) an event that results in a transformation | Synonyms: conversion, transition |
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| chartaceous | (adjective) of or like paper | Synonyms: paperlike, papery |
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| chlamydeous | (adjective) having a floral envelope or perianth consisting of a calyx and/or corolla | - |
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| choreograph | (verb) plan and oversee the development and details of | - |
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| (verb) compose a sequence of dance steps, often to music | - |
| choreographer | (noun) someone who creates new dances | - |
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| choreographic | (adjective) of or concerned with choreography | - |
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| choreography | (noun) a show involving artistic dancing | Synonyms: stage dancing |
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| (noun) the representation of dancing by symbols as music is represented by notes | - |
| (noun) a notation used by choreographers | - |
| chylaceous | (adjective) consisting of chyle or having the properties of chyle | Synonyms: chylous |
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| cleome | (noun) any of various often strong-smelling plants of the genus Cleome having showy spider-shaped flowers | Synonyms: spiderflower |
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| closeout | (noun) a sale intended to dispose of all remaining stock | - |
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| coetaneous | (adjective) of the same period | Synonyms: coeval, contemporaneous |
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| consanguineous | (adjective) related by blood | Synonyms: akin, blood-related, cognate, consanguine, consanguineal, kin |
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| consentaneous | (adjective) in complete agreement | Synonyms: consentient, unanimous |
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| contemporaneous | (adjective) of the same period | Synonyms: coetaneous, coeval |
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| (adjective) occurring in the same period of time | Synonyms: contemporary |