RhymeZone: piercer definitions

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Definitions of piercer:

noun: An instrument that pierces or perforates, such as a stiletto or piercel.
noun: A person who pierces, especially one who carries out body piercing.
noun: (zoology) The ovipositor, or sting, of an insect.
noun: (zoology) Any insect provided with an ovipositor.

(Definitions from Wiktionary)