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Latin word spiritus comes from Proto-Indo-European *speis- or *(s)peys- (meaning to blow, breathe) through Latin spirare (to breath)
*speis- (Proto-Indo-European)
to blow, breath
*(s)peys- (Proto-Indo-European)
to blow, breath
spirare (Latin)
to breathe
spiritus (Latin)
Breath, breathing. Energy. Light breeze. Pride, arrogance. Spirit, ghost.