What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
1Medicine
mass noun The destruction of small growths or areas of tissue using diathermy.
2literary A flash like that of lightning.
Mid 17th century (usually plural in the sense ‘flashes of lightning’): from Latin fulguratio(n-) ‘sheet lightning’, from fulgur ‘lightning’. fulguration (sense 1) dates from the early 20th century.