Source : Webster's Revised Unabridged Dictionary (1913)

Aciculate \A*cic"u*late\, Aciculated \A*cic"u*la"ted\a. (Nat.
   Hist.)
   (a) Furnished with acicul[ae].
   (b) Acicular.
   (c) Marked with fine irregular streaks as if scratched by a
       needle. --Lindley.

Source : WordNet®

aciculate
     adj : related to plants or animals or crystals having aciculae or
           needle-like parts