English
lunatical
From lunatic + -al.
Formed from lunatic + -al
Proto-Indo-European *lewk- ‘bright’
…
Latin luna ‘moon’
Late Latin lunaticus ‘moonstruck’
Old French lunatique
Middle English lunatik ‘suffering from madness due to varying lunar…’
English lunatic
Today it means
adj Lunatic.
Language periods are conventional ranges, not dates for this word.
Etymograph / lunatical