Dyacusis

Part of speech: noun

Definitions

1. Partial or complete loss of hearing in one ear while the other ear retains normal or better function
2. A condition in which sound perception is reduced or absent in a single ear, leaving the other unaffected
3. Diminished or absent hearing specifically affecting one ear rather than both ears equally

Etymology: The Greek verb "diakouein" meant "to hear through" or "to hear out," as when a judge heard a case to its end. Its noun, "diakousis," was a technical term in medical writing for impaired hearing, a sense that has nothing to do with listening to a case. The connection to hearing is shared with words like "acoustic," which comes from the Greek "akouein," "to hear." The modern term is a learned coinage built from those Greek parts, and it appears in medical and scientific contexts rather than everyday speech. Its "dy-" spelling is an alternative to "dia-," and both forms follow the same pattern. The "dia-" prefix gives the sense of "through" or "across," so the word's core meaning is hearing that passes through, or is distorted along the way, which suits a condition in which sounds are heard incorrectly.

Synonyms: dysacusis