"of, pertaining to, or characteristic of the poetry of Petrarch," 1827 (Keats uses Petrarchal, 1818), from Francesco Petrarch (Italian Petrarca) the poet (1304-1374).
petit fours
petite
petitio principii
petition
petitioner
Petrarchan
petrel
Petri dish
petrifaction
petrification
petrified
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