Elaysian tears were a liquid substance secreted from the tear ducts of Elaysians. It acted as an allergen in some humans, and an Elaysian tear anti-allergen was available among the standard medical supplies for Starfleet away teams in the late 24th century. (SCE eBook: Fables of the Prime Directive)

This was likely intended to be a reference to Elasian tears, a powerful biochemical established in TOS episode: "Elaan of Troyius".

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