noun Date: circa 1928 a chemical group consisting of four pyrrole rings joined either in a straight chain or in a ring (as in chlorophyll)
TETRAPYRROLE
Meaning of TETRAPYRROLE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012