冥诞

冥誕
míngdàn

birthday for someone who has died

Wiktionary

Entry Composition

=1 冥 míng old variant of 冥 míng
=1 冥 míng
  1. dark
  2. deep
  3. stupid
  4. the underworld
=1 冥 mián only used in 顛冥／颠冥
=1 冥 miàn only used in 冥眴
2 诞 dàn
  1. birth
  2. birthday
  3. brag
  4. boast
  5. to increase