Etymology
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pesto (n.)

green, aromatic, olive oil-based pasta sauce, a Genoese specialty, 1937, from Italian pesto, contracted form of pestato, past participle of pestare "to pound, to crush," in reference to the crushed herbs and garlic in it, from Latin root of pestle.

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Definitions of pesto

pesto (n.)
a sauce typically served with pasta; contains crushed basil leaves and garlic and pine nuts and Parmesan cheese in olive oil;
From wordnet.princeton.edu