E (biochemistry) A symbol for glutamic acid.
E2 (biochemistry) A symbol for estradiol.
e (1 mathematics; 2 physics) 1 Fundamental mathematical CONSTANT and the BASE of natural (Napier ian) logarithms. It is an IRRATIONAL NUMBER, the l imit ing value of the SERIES (1+I/ n)n as n tends to INFINITY, approximately equal to 2.71828. It is the CONSTANT in an EXPONENTIAL FUNCTION or SERIES. 2 An abbreviation of ‘electron.