| CEP | one of several broad spectrum antibiotic substances obtained from fungi and related to penicillin (trade names Mefoxin) |
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| CEP | a family of plants of order Rosales |
| CEP | a family of Cephalotaxaceae |
| CEP | the genus of Cephalotaxus (see plum-yews) |
| CEP | a semisynthetic analogue of cephalosporin |
| CEP | one species: Australian pitcher plant |
| CEP | carnivorous perennial herb having a red-brown-marked green pitcher and hinged lid both with red edges |
| CEP | a faint constellation in the northern hemisphere near Cassiopeia and the Pole Star |
| CEP | a genus of birds including: guillemots |
| CEP | North Pacific guillemot |
| CEP | North Atlantic guillemot |