Definition: The word 'lancash' is a noun that refers to an ancient Roman military unit, also known as the 'Aquila'. In classical antiquity, the term was used for a form of infantry unit that had its origins in ancient Greece. The Latin word 'lancus' translates into English as 'lance', while 'ash' represents the helmet worn by the unit's leader. Therefore, 'lancash' can be thought of as an ancient Roman military unit with a distinctive headgear and traditional combat attire.