This term stems from the late Latin “coriaceus,” originally from the Latin “corium,” meaning “skin, hide, leather.” “Coriaceous” is often used as an adjective in the botanical field — the large, paddle-shaped leaves of rhododendrons, for instance, are coriaceous. In biology taxonomy terms, “subcoriaceus” means “somewhat leathery,” and “tenuicoriaceus” means “thinly or finely coriaceous.”