| acold | (adjective) of persons; feeling cold | - |
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| acolyte | (noun) someone who assists a priest or minister in a liturgical service; a cleric ordained in the highest of the minor orders in the Roman Catholic Church but not in the Anglican Church or the Eastern Orthodox Churches | - |
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| aconite | (noun) any of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowers | - |
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| acorea | (noun) absence of the pupil in an eye | - |
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| acorn | (noun) fruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped base | - |
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| acousma | (noun) illusory auditory perception of strange nonverbal sounds | Synonyms: auditory hallucination |
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| acoustic | (adjective) of or relating to the science of acoustics | Synonyms: acoustical |
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| (noun) a remedy for hearing loss or deafness | - |
| acoustical | (adjective) of or relating to the science of acoustics | Synonyms: acoustic |
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| acoustically | (adverb) with respect to acoustics | - |
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| acoustician | (noun) a physicist who specializes in acoustics | - |
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| acousticophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: phonophobia |
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| acoustics | (noun) the study of the physical properties of sound | - |
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