| 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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| 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 |
| 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 | (noun) a line that indicates a boundary | Synonyms: border, boundary line, delimitation, mete |
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| 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 |
| 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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| 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 |
| boring | (noun) the act of drilling a hole in the earth in the hope of producing petroleum | Synonyms: drilling, oil production |
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| (noun) the act of drilling | Synonyms: drilling |
| boringness | (noun) extreme dullness; lacking spirit or interest | Synonyms: dreariness, insipidity, insipidness |
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| 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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| 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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| 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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