adjective Etymology: Greek plak-, plax flat surface Date: 1842 of, relating to, or being a scale of dermal origin with an enamel-tipped spine characteristic of the elasmobranchs
PLACOID
Meaning of PLACOID in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012