| dorbeetle | (noun) Old World dung beetle that flies with a droning sound | - |
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| dork | (noun) a dull stupid fatuous person | Synonyms: jerk |
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| dorm | (noun) a college or university building containing living quarters for students | Synonyms: dormitory, hall, residence hall, student residence |
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| dormancy | (noun) quiet and inactive restfulness | Synonyms: quiescence, quiescency, sleeping |
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| (noun) a state of quiet (but possibly temporary) inaction | Synonyms: quiescence, quiescency |
| dormer | (noun) a gabled extension built out from a sloping roof to accommodate a vertical window | Synonyms: dormer window |
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| dormitory | (noun) a college or university building containing living quarters for students | Synonyms: dorm, hall, residence hall, student residence |
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| (noun) a large sleeping room containing several beds | Synonyms: dorm room, dormitory room |
| dormouse | (noun) small furry-tailed squirrel-like Old World rodent that becomes torpid in cold weather | - |
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| dorsiflexion | (noun) the act of bending backward (of the body or a body part) | - |
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| dorsum | (noun) the back of the body of a vertebrate or any analogous surface (as the upper or outer surface of an organ or appendage or part) | - |
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| (noun) the posterior part of a human (or animal) body from the neck to the end of the spine | Synonyms: back |
| dory | (noun) marine fishes widely distributed in mid-waters and deep slope waters | - |
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| (noun) pike-like freshwater perches | Synonyms: jack salmon, Stizostedion vitreum, walleye, walleyed pike |
| (noun) a small boat of shallow draft with cross thwarts for seats and rowlocks for oars with which it is propelled | Synonyms: dinghy, rowboat |