Crown of Thorns (woodworking)
WordNet
noun
(1) A mock crown made of thorn branches that Roman soldiers placed on Jesus before the Crucifixion
(2) Somewhat climbing bushy spurge of Madagascar having long woody spiny stems with few leaves and flowers with scarlet bracts
(3) Any affliction that causes great suffering
"That is his cross to bear"
"He bears his afflictions like a crown of thorns"