| abactinal | (adjective) (of radiate animals) located on the surface or end opposite to that on which the mouth is situated | - |
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| ahorseback | (adjective) traveling on horseback | Synonyms: ahorse |
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| antibacterial | (adjective) destroying bacteria or inhibiting their growth | - |
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| baccate | (adjective) resembling a berry | Synonyms: berrylike |
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| (adjective) producing or bearing berries | Synonyms: bacciferous, berried |
| bacchanal | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanalian, bacchic, carousing, orgiastic |
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| bacchanalian | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchic, carousing, orgiastic |
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| bacchantic | (adjective) of or relating to or resembling a bacchanalian reveler | - |
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| bacchic | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchanalian, carousing, orgiastic |
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| bacciferous | (adjective) producing or bearing berries | Synonyms: baccate, berried |
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| baccivorous | (adjective) feeding on berries | - |
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| bacillar | (adjective) relating to or produced by or containing bacilli | Synonyms: bacillary |
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| (adjective) formed like a bacillus | Synonyms: bacillary, bacilliform, baculiform, rod-shaped |
| bacillary | (adjective) relating to or produced by or containing bacilli | Synonyms: bacillar |
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| (adjective) formed like a bacillus | Synonyms: bacillar, bacilliform, baculiform, rod-shaped |
| bacilliform | (adjective) formed like a bacillus | Synonyms: bacillar, bacillary, baculiform, rod-shaped |
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| back | (adjective) related to or located at the back | - |
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| (adjective) of an earlier date | - |
| (adjective) located at or near the back of an animal | Synonyms: hind, hinder |
| backbreaking | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome |
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| backed | (adjective) having a back or backing, usually of a specified type | - |
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| (adjective) used of film that is coated on the side opposite the emulsion with a substance to absorb light | - |
| backhand | (adjective) (of racket strokes) made across the body with back of hand facing direction of stroke | Synonyms: backhanded |
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| (adjective) (of handwriting) having the letters slanting backward | Synonyms: left-slanting |
| backhanded | (adjective) (of racket strokes) made across the body with back of hand facing direction of stroke | Synonyms: backhand |
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| (adjective) roundabout or ambiguous | - |
| backless | (adjective) lacking a back | - |
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| backmost | (adjective) located farthest to the rear | Synonyms: hindermost, hindmost, rearmost |
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| backstage | (adjective) concealed from public view or attention | Synonyms: offstage |
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| backstair | (adjective) secret and sly or sordid | Synonyms: backstairs, furtive |
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| backstairs | (adjective) secret and sly or sordid | Synonyms: backstair, furtive |
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| backswept | (adjective) used of hair | Synonyms: sweptback |
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| backward | (adjective) directed or facing toward the back or rear | - |
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| (adjective) (used of temperament or behavior) marked by a retiring nature | - |
| (adjective) retarded in intellectual development | Synonyms: feebleminded, half-witted, slow-witted |
| (adjective) having made less than normal progress | - |
| bacteremic | (adjective) of or relating to or having bacteremia | - |
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| bacterial | (adjective) relating to or caused by bacteria | - |
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| bactericidal | (adjective) preventing infection by inhibiting the growth or action of microorganisms | Synonyms: disinfectant, germicidal |
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| bacterioid | (adjective) resembling bacteria | Synonyms: bacterioidal, bacteroid, bacteroidal |
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| bacterioidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacteroid, bacteroidal |
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| bacteriologic | (adjective) of or relating to bacteriology | Synonyms: bacteriological |
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| bacteriological | (adjective) of or relating to bacteriology | Synonyms: bacteriologic |
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| bacteriolytic | (adjective) of or relating to or causing bacteriolysis | - |
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| bacteriophagic | (adjective) of or relating to bacteriophages | Synonyms: bacteriophagous |
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| bacteriophagous | (adjective) of or relating to bacteriophages | Synonyms: bacteriophagic |
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| bacteriostatic | (adjective) of or relating to or causing bacteriostasis | - |
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| bacteroid | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroidal |
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| bacteroidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroid |
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| baculiform | (adjective) formed like a bacillus | Synonyms: bacillar, bacillary, bacilliform, rod-shaped |
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| bareback | (adjective) riding without a saddle | Synonyms: barebacked |
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| barebacked | (adjective) riding without a saddle | Synonyms: bareback |
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| bulbaceous | (adjective) producing or growing from bulbs | - |
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| crookback | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookbacked, gibbous, humpbacked, humped, hunchbacked, kyphotic |
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| crookbacked | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, gibbous, humpbacked, humped, hunchbacked, kyphotic |
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| cyanobacterial | (adjective) relating to or caused by photosynthetic bacteria of the class Cyanobacteria | Synonyms: cyanophyte |
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| hardback | (adjective) having a hard back or cover | Synonyms: hardbacked, hardbound, hardcover |
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| hardbacked | (adjective) having a hard back or cover | Synonyms: hardback, hardbound, hardcover |
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| herbaceous | (adjective) characteristic of a nonwoody herb or plant part | - |
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| humpbacked | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, crookbacked, gibbous, humped, hunchbacked, kyphotic |
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| hunchbacked | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, crookbacked, gibbous, humpbacked, humped, kyphotic |
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| outback | (adjective) inaccessible and sparsely populated | Synonyms: remote |
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| paperback | (adjective) (of books) having a flexible binding | Synonyms: paperbacked |
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| paperbacked | (adjective) (of books) having a flexible binding | Synonyms: paperback |
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| pilosebaceous | (adjective) of or relating to a hair follicle and its sebaceous gland | - |
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| razorback | (adjective) having a sharp narrow back | Synonyms: razor-backed |
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| sebaceous | (adjective) containing an unusual amount of grease or oil | Synonyms: greasy, oily, oleaginous |
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| subacid | (adjective) slightly sour to the taste | - |
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| subacute | (adjective) less than acute; relating to a disease present in a person with no symptoms of it | - |
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| swayback | (adjective) having abnormal sagging of the spine (especially in horses) | Synonyms: dipped, lordotic, swaybacked |
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| swaybacked | (adjective) having abnormal sagging of the spine (especially in horses) | Synonyms: dipped, lordotic, swayback |
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| sweptback | (adjective) used of hair | Synonyms: backswept |
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| (adjective) (especially of aircraft wings) angled rearward from the point of attachment | - |
| throwback | (adjective) characteristic of an atavist | Synonyms: atavistic |
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| unbacked | (adjective) unsupported by other people | Synonyms: single-handed, unassisted |
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