| abysm | (noun) a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively) | Synonyms: abyss |
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| abysmal | (adjective) resembling an abyss in depth; so deep as to be unmeasurable | Synonyms: abyssal, unfathomable |
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| (adjective) very great; limitless | - |
| abysmally | (adverb) in a terrible manner | Synonyms: abominably, atrociously, awfully, rottenly, terribly |
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| abyss | (noun) a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively) | Synonyms: abysm |
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| abyssal | (adjective) relating to ocean depths from 2000 to 5000 meters | - |
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| (adjective) resembling an abyss in depth; so deep as to be unmeasurable | Synonyms: abysmal, unfathomable |
| ambystomid | (noun) small to moderate-sized terrestrial or semiaquatic New World salamander | Synonyms: ambystomid salamander |
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| babysit | (verb) work or act as a baby-sitter | Synonyms: baby-sit, sit |
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| (verb) take watchful responsibility for | Synonyms: baby-sit |
| babysitter | (noun) a person engaged to care for children when the parents are not home | Synonyms: baby-sitter, sitter |
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| babysitting | (noun) the work of a baby sitter; caring for children when their parents are not home | Synonyms: baby sitting |
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| bobbysock | (noun) a sock that reaches just above the ankle | Synonyms: anklet, anklets, bobbysocks |
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| bobbysocks | (noun) a sock that reaches just above the ankle | Synonyms: anklet, anklets, bobbysock |
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| bobbysoxer | (noun) an adolescent girl wearing bobby socks (common in the 1940s) | Synonyms: bobby-socker |
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| byssus | (noun) tuft of strong filaments by which e.g. a mussel makes itself fast to a fixed surface | Synonyms: beard |
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| bystander | (noun) a nonparticipant spectator | - |
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