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There are 5 twelve-letter words containing ACOUST

ACOUSTICALLY	• acoustically adv. (Manner) In an acoustic manner, or using an acoustic musical instrument. • acoustically adv. (Domain) From the perspective of acoustics. • ACOUSTICAL adv. relating to the science of sound, also ACOUSTIC.
ACOUSTICIANS	• acousticians n. Plural of acoustician. • ACOUSTICIAN n. one versed in the science of acoustics.
BIOACOUSTICS	• bioacoustics n. A cross-disciplinary science that combines biology and acoustics, investigating for instance the mechanisms… • BIOACOUSTICS n. a branch of science concerned with the production of sound by and its effects on living organisms.
CATACOUSTICS	• catacoustics n. (Archaic) The science which studies reflected sound. • CATACOUSTICS n. the science of echoes or reflected sounds.
OPTOACOUSTIC	• optoacoustic adj. (Physics) Describing any of several interactions between light and sound. • OPTOACOUSTIC adj. relating to or combining both vision and hearing.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

See this list for:

English Wiktionary: 18 words
Scrabble in French: 2 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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