Wordnet 3.0
NOUN (1)
1. 
 medium to tall fir of western North America having a conic crown and branches in tiers; 
 leaves smell of orange when crushed; 
[syn: amabilis fir, white fir, Pacific silver fir, red silver fir, Christmas tree, Abies amabilis]
WordNet (r) 3.0 (2006):
red silver fir
    n 1: medium to tall fir of western North America having a conic
         crown and branches in tiers; leaves smell of orange when
         crushed [syn: amabilis fir, white fir, Pacific silver
         fir, red silver fir, Christmas tree, Abies amabilis]