“+ noun
Etymology: International Scientific Vocabulary diiod- + tyrosine
: a crystalline amino acid HOC 6 H 2 I 2 CH 2 CH(NH 2 )COOH obtained by hydrolysis of thyroglobulin and of proteins from corals and sponges and held to be a precursor of triiodothyronine and thyroxine in the thyroid gland — called also 3,5-diiodotyrosine, iodogorgoic acid