crown_of_thorns
1. [ noun ] (botany) somewhat climbing bushy spurge of Madagascar having long woody spiny stems with few leaves and flowers with scarlet bracts
Synonyms: Christ_plant Euphorbia_milii Christ_thorn
Related terms: spurge Euphorbia
2. [ noun ] any affliction that causes great suffering
Synonyms: cross
Examples:

"that is his cross to bear" "he bears his afflictions like a crown of thorns"

Related terms: affliction thwart
3. [ noun ] (Christianity) a mock crown made of thorn branches that Roman soldiers placed on Jesus before the Crucifixion
Related terms: crown