aculeus

Definitions of aculeus

1. noun

   a sharp-pointed process especially a sting of a hymenopterous insect
   type of:

   stinger

   a sharp organ of offense or defense (as of a wasp or stingray or scorpion) often connected with a poison gland
2. noun

   a stiff sharp-pointed plant process
   types:

   pricker, prickle, spikelet, spine, sticker, thorn

   a small sharp-pointed tip resembling a spike on a stem or leaf

   glochid, glochidium

   a barbed spine or bristle (often tufted on cacti)

   type of:

   enation, plant process

   a natural projection or outgrowth from a plant body or organ