a. [ L. acerbus, fr. acer sharp: cf. F. acerbe. See Acrid. ] Sour, bitter, and harsh to the taste, as unripe fruit; sharp and harsh. [ 1913 Webster ]
v. t. [ L. acerbatus, p. p. of acerbare, fr. acerbus. ] To sour; to imbitter; to irritate. [ 1913 Webster ]
a. Sour or severe. [ 1913 Webster ]
n. [ L. acerbitudo, fr. acerbus. ] Sourness and harshness. [ Obs. ] Bailey. [ 1913 Webster ]
n. [ F. acerbité, L. acerbitas, fr. acerbus. See Acerb. ]