Definition of methionyl in English:
methionyl
noun mɪˈθʌɪənɪlmɪˈθʌɪənʌɪl
Biochemistry The aminoacyl group derived from methionine, CH₃S(CH₂)₂CH(NH₂)CO—.
Origin
1930s; earliest use found in Proceedings of the National Academy of Sciences of the United States of America. From methion- + -yl.