ˈ ̷ ̷ˌ ̷ ̷ noun
( -s )
Etymology: Middle English hertes horn, from Old English heortes horn, from heortes (gen. of heort hart) + horn
1. : a hart's horn or antler
2. archaic
a. : ammonia water
b. : ammonium carbonate c
3. or hartshorn plantain : buckhorn 3b(1)