lep·to·ceph·a·lous \| ̷ ̷ ̷ ̷|sefələs\adjective alsolep·to·ce·phal·ic\-_sə̇|falik\ Etymology: New Latin leptocephalus + English -ous or -ic 1.: of, relating to, or having the characteristics of a leptocephalus 2.[leptocephaly + -ous or -ic]: characterized by or exhibiting leptocephaly