Wordnet 3.0
NOUN (2)
1. 
 plant bearing large mild thick-walled usually bell-shaped fruits; 
 the principal salad peppers; 
[syn: sweet pepper, bell pepper, pimento, pimiento, paprika, sweet pepper plant, Capsicum annuum grossum]
2.  large mild crisp thick-walled capsicum peppers usually bell-shaped or somewhat oblong;  commonly used in salads; 
WordNet (r) 3.0 (2006):
sweet pepper
    n 1: plant bearing large mild thick-walled usually bell-shaped
         fruits; the principal salad peppers [syn: sweet pepper,
         bell pepper, pimento, pimiento, paprika, sweet
         pepper plant, Capsicum annuum grossum]
    2: large mild crisp thick-walled capsicum peppers usually bell-
       shaped or somewhat oblong; commonly used in salads