The Collaborative International Dictionary of English v.0.48:

Spicula \Spic"u*la\, n.; pl. Spiculae. [NL., dim. of L. spica
   a spike, ear.] (Bot.)
   (a) A little spike; a spikelet.
   (b) A pointed fleshy appendage.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spiculum \Spic"u*lum\, n.; pl. Spicula. [L., a little point.]
   (Zool.)
   Same as Spicule.
   [1913 Webster]