tuilérë noun *"Spring-day", a day outside the months in the Steward's Reckoning, inserted between Súlimë and Víressë (rough equivalents of March and April). In Tolkien's early "Qenya", Tuilérë was simply glossed "Spring" (LT1:269).
Quenya
Víressë
april
víressë
noun. April, *Freshness
tuilérë
spring-day
Víressë noun, fourth month of the year, "April" (Appendix D). The Quenya name is apparently related to words for youth and freshness; compare vírië, virya.