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1. A small sharp-pointed tip resembling a spike on a stem or leaf
   - spine, thorn, prickle, pricker, spikelet
    
2. An adhesive label
   - gummed label, paster
    
3. A particularly difficult or baffling question or problem
   - poser, stumper, toughie
    
4. A short knife with a pointed blade used for piercing or stabbing
   - dagger

Derived forms: stickers

See also: stick

Type of: aculeus, knife, label, problem

Encyclopedia: Sticker