MEANING: noun: A huge or difficult task.

ETYMOLOGY: After Mount Pelion, a mountain in Greece. Earliest documented use: 1560.

NOTES: In Greek mythology, the twins Otus and Ephialtes piled Mount Pelion on Mount Ossa and both on Mount Olympus in an attempt to reach heaven and attack the gods. The word is mainly used in the idiom “to pile Pelion upon Ossa” meaning to make a challenging task even more difficult by piling something on top of it.

pHELION - the acidity of a solar orbit

PET LION - not allowed in most municipalities (or zoos)

PELICON - seabird with a big distensible pouch in its mouth