phenyl
Concise Oxford English Dictionary © 2008 Oxford University Press:
phenyl /ˈfiːnʌɪl, ˈfɛnɪl/
▶noun [as modifier] Chemistry of or denoting the radical –C6H5, derived from benzene.
– origin C19: from Fr. phényle, from Gk phaino- ‘shining’ (because first used in names of by-products of the manufacture of gas for illumination).
'phenyl' also found in these Oxford entries:

