| orchard | (noun) garden consisting of a small cultivated wood without undergrowth | Synonyms: grove, plantation, woodlet |
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| orchestra | (noun) seating on the main floor in a theater | - |
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| (noun) a musical organization consisting of a group of instrumentalists including string players | - |
| orchestral | (adjective) relating to or composed for an orchestra | - |
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| orchestrate | (verb) plan and direct (a complex undertaking) | Synonyms: direct, engineer, mastermind, organise, organize |
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| (verb) write an orchestra score for | - |
| orchestrated | (adjective) arranged for performance by an orchestra | - |
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| orchestration | (noun) the act of arranging a piece of music for an orchestra and assigning parts to the different musical instruments | Synonyms: instrumentation |
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| (noun) an arrangement of events that attempts to achieve a maximum effect | - |
| (noun) an arrangement of a piece of music for performance by an orchestra or band | - |
| orchestrator | (noun) an arranger who writes for orchestras | - |
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| orchid | (noun) any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors | Synonyms: orchidaceous plant |
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| orchidalgia | (noun) pain in the testes | - |
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| orchidectomy | (noun) surgical removal of one or both testicles | Synonyms: orchiectomy |
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| orchiectomy | (noun) surgical removal of one or both testicles | Synonyms: orchidectomy |
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| orchil | (noun) any of various lecanoras that yield the dye archil | Synonyms: archil |
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| (noun) a purplish dye obtained from orchil lichens | Synonyms: archil, cudbear |
| orchiopexy | (noun) operation to bring an undescended testicle into the scrotum | - |
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| orchis | (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, ballock, bollock, egg, nut, testicle, testis |
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| (noun) any of various deciduous terrestrial orchids having fleshy tubers and flowers in erect terminal racemes | - |
| orchitis | (noun) inflammation of one or both testes; characterized by pain and swelling | - |
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| orchotomy | (noun) surgical incision into the testis to obtain material for analysis (as in cases of abnormally low sperm count) | - |
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