[1] : The Collaborative International Dictionary of English v.0.48

setaceous \seta"ceous\ s-et=a"shu^s, a. l. seta a
   bristle: cf. f. s'etac'e.
   1. set with, or consisting of, bristles; bristly; as, a
      stiff, setaceous tail.
      1913 webster

   2. bristelike in form or texture; as, a setaceous feather; a
      setaceous leaf.
      1913 webster

[2] : WordNet (r) 2.0

setaceous
     adj : having or covered with protective barbs or quills or spines
           or thorns or setae etc.; "a horse with a short bristly
           mane"; "bristly shrubs"; "burred fruits"; "setaceous
           whiskers" syn: barbed, barbellate, briary, briery,
            bristled, bristly, burred, burry, prickly, setose,
            spiny, thorny
see also:
barbed barbellate briary briery bristled bristly 
burred burry prickly setose spiny 
thorny 

Setaceous >> S Words
Setaceous, definition of term: Setaceous
setaceous_pag1.html