| aborad | (adverb) away from the mouth or oral region | - |
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| aboral | (adjective) opposite to or away from the mouth | - |
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| aboriginal | (adjective) characteristic of or relating to people inhabiting a region from the beginning | Synonyms: native |
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| (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: primaeval, primal, primeval, primordial |
| (noun) an indigenous person who was born in a particular place | Synonyms: aborigine, indigen, indigene, native |
| aborigine | (noun) an indigenous person who was born in a particular place | Synonyms: aboriginal, indigen, indigene, native |
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| abort | (noun) the act of terminating a project or procedure before it is completed | - |
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| (verb) terminate a pregnancy by undergoing an abortion | - |
| (verb) cease development, die, and be aborted | - |
| (verb) terminate before completion | - |
| aborticide | (noun) the act of destroying a fetus | Synonyms: feticide |
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| (noun) a drug (or other chemical agent) that causes abortion | Synonyms: abortifacient, abortion-inducing drug |
| abortifacient | (adjective) causing abortion | - |
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| (noun) a drug (or other chemical agent) that causes abortion | Synonyms: aborticide, abortion-inducing drug |
| abortion | (noun) termination of pregnancy | - |
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| (noun) failure of a plan | Synonyms: miscarriage |
| abortionist | (noun) a person (who should be a doctor) who terminates pregnancies | - |
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| abortive | (adjective) failing to accomplish an intended result | Synonyms: stillborn, unsuccessful |
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| abortively | (adverb) in an unfruitful manner | - |
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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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| airborne | (adjective) moved or conveyed by or through air | - |
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| arbor | (noun) a framework that supports climbing plants | Synonyms: arbour, bower, pergola |
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| (noun) any of various rotating shafts that serve as axes for larger rotating parts | Synonyms: mandrel, mandril, spindle |
| (noun) tree (as opposed to shrub) | - |
| arboraceous | (adjective) abounding in trees | Synonyms: arboreous, woodsy, woody |
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| arborary | (adjective) of or relating to or formed by trees | Synonyms: arboreal, arborical, arborous |
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| arboreal | (adjective) inhabiting or frequenting trees | Synonyms: arboreous, tree-living |
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| (adjective) of or relating to or formed by trees | Synonyms: arborary, arborical, arborous |
| (adjective) resembling a tree in form and branching structure | Synonyms: arboreous, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
| 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 |
| arborescent | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arboresque | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arboretum | (noun) a facility where trees and shrubs are cultivated for exhibition | Synonyms: botanical garden |
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| arborical | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborous |
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| arboriculture | (noun) the tending of and caring for trees | Synonyms: tree farming |
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| arboriculturist | (noun) someone trained in forestry | Synonyms: forester, tree farmer |
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| arboriform | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboresque, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arborise | (verb) branch out like trees | Synonyms: arborize |
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| arborist | (noun) a specialist in treating damaged trees | Synonyms: tree surgeon |
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| arborize | (verb) branch out like trees | Synonyms: arborise |
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| arborolatry | (noun) the worship of trees | Synonyms: tree-worship |
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| arborous | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborical |
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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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| arborvitae | (noun) any of several Asian and North American conifers of the genera Thuja and Thujopsis | - |
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| baseborn | (adjective) illegitimate | Synonyms: base |
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| (adjective) of low birth or station (`base' is archaic in this sense) | Synonyms: base, humble, lowly |
| belabor | (verb) attack verbally with harsh criticism | Synonyms: belabour |
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| (verb) beat soundly | Synonyms: belabour |
| (verb) to work at or to absurd length | Synonyms: belabour |
| boracic | (adjective) of or relating to or derived from or containing boron | Synonyms: boric |
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| borage | (noun) an herb whose leaves are used to flavor sauces and punches; young leaves can be eaten in salads or cooked | - |
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| (noun) hairy blue-flowered European annual herb long used in herbal medicine and eaten raw as salad greens or cooked like spinach | Synonyms: Borago officinalis, tailwort |
| borate | (noun) a salt or ester of boric acid | - |
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| borated | (adjective) mixed or impregnated with borax | - |
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| borax | (noun) an ore of boron consisting of hydrated sodium borate; used as a flux or cleansing agent | - |
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| bordelaise | (noun) brown sauce with beef marrow and red wine | - |
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| bordello | (noun) a building where prostitutes are available | Synonyms: bagnio, bawdyhouse, brothel, cathouse, house of ill repute, house of prostitution, sporting house, whorehouse |
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| border | (noun) a strip forming the outer edge of something | - |
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| (noun) a decorative recessed or relieved surface on an edge | Synonyms: molding, moulding |
| (noun) a line that indicates a boundary | Synonyms: borderline, boundary line, delimitation, mete |
| (noun) the boundary of a surface | Synonyms: edge |
| (noun) the boundary line or the area immediately inside the boundary | Synonyms: margin, perimeter |
| (verb) lie adjacent to another or share a boundary | Synonyms: abut, adjoin, butt, butt against, butt on, edge, march |
| (verb) extend on all sides of simultaneously; encircle | Synonyms: environ, ring, skirt, surround |
| (verb) enclose in or as if in a frame | Synonyms: frame, frame in |
| (verb) provide with a border or edge | Synonyms: edge |
| (verb) form the boundary of; be contiguous to | Synonyms: bound |
| bordered | (adjective) having a border especially of a specified kind; sometimes used as a combining term | - |
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| borderer | (noun) an inhabitant of a border area (especially the border between Scotland and England) | - |
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| borderland | (noun) district consisting of the area on either side of a border or boundary of a country or an area | Synonyms: border district, march, marchland |
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| borderline | (adjective) of questionable or minimal quality | Synonyms: marginal |
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| (noun) a line that indicates a boundary | Synonyms: border, boundary line, delimitation, mete |
| bore | (noun) a hole or passage made by a drill; usually made for exploratory purposes | Synonyms: bore-hole, drill hole |
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| (noun) diameter of a tube or gun barrel | Synonyms: caliber, calibre, gauge |
| (noun) a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary) | Synonyms: aegir, eager, eagre, tidal bore |
| (noun) a person who evokes boredom | Synonyms: dullard |
| (verb) make a hole, especially with a pointed power or hand tool | Synonyms: drill |
| (verb) cause to be bored | Synonyms: tire |
| boreal | (adjective) toward or located in the north | - |
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| (adjective) relating to or marked by qualities associated with the north wind | - |
| (adjective) comprising or throughout far northern regions | Synonyms: circumboreal |
| boreas | (noun) a wind that blows from the north | Synonyms: north wind, norther, northerly |
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| borecole | (noun) a hardy cabbage with coarse curly leaves that do not form a head | Synonyms: Brassica oleracea acephala, cole, colewort, kail, kale |
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| bored | (adjective) tired of the world | Synonyms: world-weary |
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| (adjective) uninterested because of frequent exposure or indulgence | Synonyms: blase |
| boredom | (noun) the feeling of being bored by something tedious | Synonyms: ennui, tedium |
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| borer | (noun) any of various insects or larvae or mollusks that bore into wood | Synonyms: woodborer |
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| (noun) a drill for penetrating rock | Synonyms: bore bit, rock drill, stone drill |
| boric | (adjective) of or relating to or derived from or containing boron | Synonyms: boracic |
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| boring | (adjective) so lacking in interest as to cause mental weariness | Synonyms: deadening, dull, ho-hum, irksome, slow, tedious, tiresome, wearisome |
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| (noun) the act of drilling a hole in the earth in the hope of producing petroleum | Synonyms: drilling, oil production |
| (noun) the act of drilling | Synonyms: drilling |
| boringly | (adverb) in a tedious manner | Synonyms: tediously, tiresomely |
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| boringness | (noun) extreme dullness; lacking spirit or interest | Synonyms: dreariness, insipidity, insipidness |
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| born | (adjective) brought into existence | - |
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| (adjective) being talented through inherited qualities | Synonyms: innate, natural |
| bornite | (noun) a mineral consisting of sulfides of copper and iron that is found in copper deposits | Synonyms: peacock ore |
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| boron | (noun) a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder | Synonyms: atomic number 5, B |
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| boronic | (adjective) of or relating to boron | - |
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| borosilicate | (noun) a salt of boric and silicic acids | - |
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| borough | (noun) one of the administrative divisions of a large city | - |
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| (noun) an English town that forms the constituency of a member of parliament | - |
| borrelia | (noun) cause of e.g. European and African relapsing fever | - |
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| borrow | (verb) get temporarily | - |
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| (verb) take up and practice as one's own | Synonyms: adopt, take over, take up |
| borrower | (noun) someone who receives something on the promise to return it or its equivalent | - |
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| borrowing | (noun) obtaining funds from a lender | - |
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| (noun) the appropriation (of ideas or words etc) from another source | Synonyms: adoption |
| borsch | (noun) a Russian or Polish soup usually containing beet juice as a foundation | Synonyms: borscht, borsh, borshch, borsht, bortsch |
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| borscht | (noun) a Russian or Polish soup usually containing beet juice as a foundation | Synonyms: borsch, borsh, borshch, borsht, bortsch |
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| borsh | (noun) a Russian or Polish soup usually containing beet juice as a foundation | Synonyms: borsch, borscht, borshch, borsht, bortsch |
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| borshch | (noun) a Russian or Polish soup usually containing beet juice as a foundation | Synonyms: borsch, borscht, borsh, borsht, bortsch |
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| borsht | (noun) a Russian or Polish soup usually containing beet juice as a foundation | Synonyms: borsch, borscht, borsh, borshch, bortsch |
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| borstal | (noun) formerly a British reform school for youths considered too young to send to prison | - |
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| bortsch | (noun) a Russian or Polish soup usually containing beet juice as a foundation | Synonyms: borsch, borscht, borsh, borshch, borsht |
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| borzoi | (noun) tall fast-moving dog breed | Synonyms: Russian wolfhound |
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| carborundum | (noun) an abrasive composed of silicon carbide crystals | - |
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| circumboreal | (adjective) comprising or throughout far northern regions | Synonyms: boreal |
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| collaborate | (verb) work together on a common enterprise or project | Synonyms: cooperate, join forces |
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| (verb) cooperate as a traitor | - |
| collaboration | (noun) act of working jointly | Synonyms: coaction |
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| (noun) act of cooperating traitorously with an enemy that is occupying your country | Synonyms: collaborationism, quislingism |
| collaborationism | (noun) act of cooperating traitorously with an enemy that is occupying your country | Synonyms: collaboration, quislingism |
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| collaborationist | (noun) someone who collaborates with an enemy occupying force | Synonyms: collaborator, quisling |
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| collaborative | (adjective) accomplished by collaboration | - |
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| collaborator | (noun) an associate in an activity or endeavor or sphere of common interest | Synonyms: cooperator, pardner, partner |
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| (noun) someone who collaborates with an enemy occupying force | Synonyms: collaborationist, quisling |
| (noun) someone who assists in a plot | Synonyms: confederate, henchman, partner in crime |
| corroborant | (adjective) used of a medicine that is strengthening | - |
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| corroborate | (verb) establish or strengthen as with new evidence or facts | Synonyms: affirm, confirm, substantiate, support, sustain |
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| (verb) give evidence for | Synonyms: validate |
| (verb) support with evidence or authority or make more certain or confirm | Synonyms: bear out, support, underpin |
| corroboration | (noun) confirmation that some fact or statement is true through the use of documentary evidence | Synonyms: certification, documentation |
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| corroborative | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroboratory, substantiating, substantiative, validating, validatory, verificatory, verifying |
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| corroboratory | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, substantiating, substantiative, validating, validatory, verificatory, verifying |
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| counterbore | (noun) a bit for enlarging the upper part of a hole | Synonyms: countersink, countersink bit |
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| cyborg | (noun) a human being whose body has been taken over in whole or in part by electromechanical devices | - |
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| earthborn | (adjective) connected with earthly life; of earthly origin | - |
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| (adjective) springing from or born on the earth | - |
| (adjective) of earthly origin (as mortals are) | - |
| elaborate | (adjective) developed or executed with care and in minute detail | Synonyms: detailed, elaborated |
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| (adjective) marked by complexity and richness of detail | Synonyms: luxuriant |
| (verb) make more complex, intricate, or richer | Synonyms: complicate, rarify, refine |
| (verb) work out in detail | Synonyms: work out |
| (verb) add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing | Synonyms: dilate, enlarge, expand, expatiate, exposit, expound, flesh out, lucubrate |
| (verb) produce from basic elements or sources; change into a more developed product | - |
| elaborated | (adjective) developed or executed with care and in minute detail | Synonyms: detailed, elaborate |
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| elaborately | (adverb) with elaboration | Synonyms: in an elaborate way, intricately |
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| elaborateness | (noun) marked by elaborately complex detail | Synonyms: elaboration, intricacy, involution |
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| (noun) an ornate appearance; being elaborately (even excessively) decorated | Synonyms: ornateness |
| elaboration | (noun) developing in intricate and painstaking detail | Synonyms: working out |
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| (noun) addition of extra material or illustration or clarifying detail | Synonyms: amplification |
| (noun) marked by elaborately complex detail | Synonyms: elaborateness, intricacy, involution |
| (noun) a discussion that provides additional information | Synonyms: enlargement, expansion |
| (noun) the result of improving something | Synonyms: refinement |
| firstborn | (adjective) first in order of birth | Synonyms: eldest |
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| (noun) the offspring who came first in the order of birth | Synonyms: eldest |
| fluoroboride | (noun) a salt of fluoroboric acid | - |
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| freeborn | (adjective) born free of free parents | - |
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| harbor | (noun) a place of refuge and comfort and security | Synonyms: harbour |
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| (noun) a sheltered port where ships can take on or discharge cargo | Synonyms: harbour, haven, seaport |
| (verb) maintain (a theory, thoughts, or feelings) | Synonyms: bear, entertain, harbour, hold, nurse |
| (verb) hold back a thought or feeling about | Synonyms: harbour, shield |
| (verb) keep in one's possession; of animals | Synonyms: harbour |
| (verb) secretly shelter (as of fugitives or criminals) | Synonyms: harbour |