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English word eustress comes from English stress, English eu- (Good, well. True, genuine.)
stress (English)
(Scotland, legal) distress; the act of distraining; also, the thing distrained.. (biology) A physical, chemical, infective agent aggressing an organism.. (biology) Aggression toward an organism resulting in a response in an attempt to restore previous conditions.. (countable, physics) Force externally applied to a body which cause internal stress within the body.. (countable, physics) The [...]
eu- (English)
Good, well. True, genuine.
eustress (English)
To cause eustress for someone. (psychology) A healthful, stimulating kind and level of stress.