n.
Pronunciation: ' lü-n ə - ˌ tik
Function: adjective
Etymology: Middle English lunatik, from Anglo-French or Late Latin; Anglo-French lunatic, from Late Latin lunaticus, from Latin luna; from the belief that lunacy fluctuated with the phases of the moon
Date: 14th century
1 a : affected with lunacy : INSANE b : designed for the care of insane persons < lunatic asylum>
2 : wildly foolish <a lunatic idea>
– lunatic noun