a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a scrap or morsel of food left at a meal.
a gadget; dingus; thingumbob.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
c.1300, from O.Fr. aigre, from V.L. *acrus, from L. acer (gen. acris) "keen, sharp" (see acrid). The Eng. word kept an alternative meaning of "pungent, sharp-edged" till 19c. (e.g. Shakespeare's "The bitter clamour of two eager tongues," in "Richard II"). Related: Eagerly; eagerness.