"covered with a bloom or powder so as to appear to be frosted," of fruits, etc., by 1818, from Latin pruinosus "frosted," from pruina "hoar-frost," from PIE *prus-uo- "sprinkling, drop" (source also of Sanskrit pruṣva "drop of dew, cool drop."
c. 1300, droupen, "to sink or hang down; be downcast or sad," from Old Norse drupa "to drop, sink, hang (the head)," related to Old English dropian "to drop" (see drop (v.)). Related: Drooped; drooping. As a noun, "act of drooping," from 1640s.
1510s, "of or pertaining to the burial of the dead," from Late Latin mortuarius "of the dead," from Latin mortuus "dead" (see mortuary (n.)).