Aldëa noun,what the Númenóreans called the fourth day of the Eldarin six-day week, dedicated to Telperion, the White Tree (Appendix D). The day was originally called Aldúya, referring to both of the Two Trees, but Númenóreans altered the name to Aldëa (presumably < *aldajā), referring to one tree (the White) only. (Appendix D) Early "Qenya" also has an adjective aldëa "tree-shadowed" (LT1:249).
aldëanoun. Tuesday, Tree-day (Númenórean), fourth day of the Númenórean week