/pee"lee euhn/ ; Gk. /pee"lee awn/ , n.
1. Mount , a mountain near the E coast of Greece, in Thessaly. 5252 ft. (1600 m).
2. pile (or heap ) Pelion on Ossa ,
a. to make matters worse; aggravate or compound a situation.
b. to engage in vain or futile efforts.