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Italian

From Latin -ōsus.

Portuguese

From Old Portuguese -oso, from Latin -ōsus, from Old Latin -ōsos from *ōnt-to-s from *-o-wont-to-s. The last form is a combination of two Proto-Indo-European suffixes: Proto-Indo-European *-went-, *-wont- and *-to-.

Spanish

From Old Spanish -oso, from Latin -ōsus.