I. adjective Date: 1830 of, relating to, or constituting an operculum, II. noun Date: circa 1890 an ~ part (as a bone or scale)
OPERCULAR
Meaning of OPERCULAR in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012