a white, crystalline, water-soluble, sweet-tasting, tetrahydroxyl compound, C 4 H 10 O 4 , related to the carbohydrates, obtained from certain lichens and used for coronary vasodilation and in the treatment of hypertension.
a sweet crystalline compound extracted from certain algae and lichens and used in medicine to dilate the blood vessels of the heart; 1,2,3,4-butanetetrol. Formula: C4H10O4
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a fool or simpleton; ninny.
a fool or simpleton; ninny.
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.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.