MEANING: adjective: Relating to sleep or dreams.

ETYMOLOGY: After Morpheus, the god of dreams in Greek mythology. He was the son of Hypnos, the god of sleep. The name of the drug morphine is also derived after Morpheus. Earliest documented use: 1788.

MORPHETIN - a catalyst that triggers the change from caterpillar to butterfly

MOR-PHOTIC - an early scheme by Eastman Kodak to encourage picture-taking

MO-RHETIC - pertaining to the flow of the Missouri river