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past participle
noun
a participle that expresses completed action
Syn: ↑perfect participle
Hypernyms: ↑participle, ↑participial

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noun, pl ⋯ -ciples [count]
grammar : the form of the verb that is used with “have” in perfect tenses and with “be” in passive constructions

The verbs “thrown” in “the ball has been thrown” and “raised” in “many hands were raised” are past participles.

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ˌpast ˈparticiple [past participle] noun (grammar)
the form of a verb that in English ends in -ed, -en, etc. and is used with the verb have to form ↑perfect tenses such as I have eaten, with the verb be to form passive sentences such as It was destroyed, or sometimes as an adjective as in an upset stomach
compare present participle

Useful english dictionary. 2012.