noun Etymology: Middle English akern, from Old English æcern; akin to Middle High German ackeran ~s collectively, Old Irish áirne sloe, Lithuanian uoga berry Date: before 12th century the nut of the oak usually seated in or surrounded by a hard woody cupule of indurated bracts
ACORN
Meaning of ACORN in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012