A word in Definitive Linguistic Notes (DLN) from 1959 for a “flower that opened and shut quickly with any change of light” based on √PIRI “blink” and with variant forms pirinde and pirne (PE17/146). These flower names were part of an attempt by Tolkien to come up with a new etymology for S. alfirin after he decided that √LA was not a negative element, so that alfirin could no longer mean “immortelle”.
Quenya
pirnë
pirnë
pirindë
noun. flower that opened and shut quickly with any change of light
pirindë
flower that opened and shut quickly with any change of light at [?some ?not] even a pansy closed
pirindë noun "a flower that opened and shut quickly with any change of light at [?some ?not] even a pansy closed" (PE17:146; reading uncertain and meaning obscure; read perhaps "…at [which] not even a pansy closed") Also pirnë.
pirnë
noun. flower that opened and shut quickly with any change of light
pirin
noun. thin rod, pin
pirindëa
adjective. cylindrical
pirinumbë
noun. cylinder (hollow)
pirina
adjective. juicy, oozy
pirnë, variant of pirindë, q.v.