| adapter | (noun) device that enables something to be used in a way different from that for which it was intended or makes different pieces of apparatus compatible | Synonyms: adaptor |
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| (noun) a musician who adapts a composition for particular voices or instruments or for another style of performance | Synonyms: arranger, transcriber |
| adopter | (noun) a person who adopts a child of other parents as his or her own child | Synonyms: adoptive parent |
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| attempter | (noun) one who tries | Synonyms: essayer, trier |
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| calypter | (noun) scalelike structure between the base of the wing and the halter of a two-winged fly | Synonyms: alula |
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| chapter | (noun) a subdivision of a written work; usually numbered and titled | - |
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| (noun) a series of related events forming an episode | - |
| (noun) a local branch of some fraternity or association | - |
| (noun) an ecclesiastical assembly of the monks in a monastery or even of the canons of a church | - |
| (noun) any distinct period in history or in a person's life | - |
| diopter | (noun) a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists | Synonyms: dioptre |
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| helicopter | (noun) an aircraft without wings that obtains its lift from the rotation of overhead blades | Synonyms: chopper, eggbeater, whirlybird |
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| hymenopter | (noun) insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing | Synonyms: hymenopteran, hymenopteron, hymenopterous insect |
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| interrupter | (noun) a device for automatically interrupting an electric current | - |
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| ornithopter | (noun) heavier-than-air craft that is propelled by the flapping of wings | Synonyms: orthopter |
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| orthopter | (noun) heavier-than-air craft that is propelled by the flapping of wings | Synonyms: ornithopter |
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| prompter | (noun) a device that displays words for people to read | Synonyms: autocue |
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| (noun) someone who assists a performer by providing the next words of a forgotten speech | Synonyms: theater prompter |
| scepter | (noun) a ceremonial or emblematic staff | Synonyms: sceptre, verge, wand |
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| (noun) the imperial authority symbolized by a scepter | Synonyms: sceptre |
| sumpter | (noun) an animal (such as a mule or burro or horse) used to carry loads | Synonyms: pack animal |
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| tempter | (noun) a person who tempts others | - |
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| thysanopter | (noun) an insect of the order Thysanoptera | Synonyms: thysanopteron, thysanopterous insect |
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