phen-

Multiple Entries:
  phen-    pheno-  

Concise Oxford English Dictionary © 2008 Oxford University Press:
phen-

▶combining form variant spelling of pheno- shortened before a vowel (as in phencyclidine).

Concise Oxford English Dictionary © 2008 Oxford University Press:
pheno- /ˈfiːnəʊ/ (also phen- before a vowel)

▶combining form

• 1 Chemistry derived from benzene: phenobarbitone.

• 2 showing: phenotype.

– origin Sense 1 from Fr. phényle ‘phenyl’, from Gk phaino- ‘shining’; both senses from Gk phainein ‘to show’.