backless

from WordNet (r) 3.0 (2006)
backless
    adj 1: lacking a back; "a stool is a backless and armless seat"
           [ant: {backed}]
    
from The Collaborative International Dictionary of English v.0.48
Backless \Back"less\, a.
   Without a back.
   [1913 Webster]
    

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