microcassette

[ mahy-kroh-kuh-set, -ka- ]
/ ˈmaɪ kroʊ kəˌsɛt, -kæ- /

noun

a very small audio tape cassette smaller than a minicassette, for use with a pocket-size tape recorder.

Origin of microcassette

First recorded in 1975–80; micro- + cassette