Sindarin 

pirin

noun. flower that opened and shut quickly with any change of light

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” (PE17/146). This flower name was 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”.

Sindarin [PE17/146] Group: Eldamo. Published by

Quenya 

pirindë

noun. flower that opened and shut quickly with any change of light

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”.

pirnë

noun. flower that opened and shut quickly with any change of light