The Collaborative International Dictionary of English v.0.48:
Ethicist \Eth"i*cist\ ([e^]th"[i^]*s[i^]st), n. One who is versed in ethics, or has written on ethics. [1913 Webster]WordNet (r) 3.0 (2006):
ethicist n 1: a philosopher who specializes in ethics [syn: ethicist, ethician]