The practice of a human engaging in sexual intercourse with an animal(noun)
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Use "zooerastia" in a sentence
"A fairly typical case of _zooerastia_ has been recorded in America by"
"Bestiality and _zooerastia_ merely present in a more marked and profoundly perverted form a further degree of the same phenomenon which we meet with in erotic _zoophilia_; the difference is that they occur either in more insensitive or in more markedly degenerate persons."
"It is, however, somewhat doubtful whether we can always or even usually distinguish between zooerastia and bestiality."