1. (n.) A minute, slender granule, or point.

2. (n.) Same as Spicula.

3. (n.) Any small calcareous or siliceous body found in the tissues of various invertebrate animals, especially in sponges and in most Alcyonaria.

bramble brier bristle burr cactus catchweed cleavers goose grass needle nettle pine needle prickle quill spiculum spike spikelet spine sticker thistle thorn yucca