One of the mysteries of the English language finally explained.
Any of various devices used to assist hearing or amplify sound. Also figurative. Compare earlier otacousticon. Now rare.
Mid 17th century; earliest use found in Henry More (1614–1687), philosopher, poet, and theologian. From ancient Greek ἀκουστικόν, neuter singular (used in ancient Greek to denote the faculty of hearing) of ἀκουστικός.
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