aculeus

Noun
  1. A stiff sharp-pointed plant process (synset 113110179)
    is a type of: enation, plant process - a natural projection or outgrowth from a plant body or organ
    subtypes: pricker, prickle, spikelet, spine, sticker, thorn - a small sharp-pointed tip resembling a spike on a stem or leaf
  2. A sharp-pointed process especially a sting of a hymenopterous insect (synset 101903732)
    is a type of: stinger - a sharp organ of offense or defense (as of a wasp or stingray or scorpion) often connected with a poison gland

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