Acicula :: Acicula (n.) One of the needlelike or bristlelike spines or prickles of some animals and plants; also, a needlelike crystal..
Acicular :: Acicular (a.) Needle-shaped; slender like a needle or bristle, as some leaves or crystals; also, having sharp points like needless..
Aciculated :: Aciculated (a.) Marked with fine irregular streaks as if scratched by a needle.