BEZOAR, in a more extensive sense, includes all substances formed stratum super stratum in the stomachs or intestines of animals; in which sense pearls, the concretions called crabs-eyes, &c. belong to the class of bezoars. To this also belong the hippolithus, or bezoar equinum, a stone sometimes found in the stomach or intestines of a horse: the monkey-bezoar, a stone said to be found in the stomachs of certain monkeys in Brazil and the East Indies, harder than the oriental bezoar, of a dark green colour, and very costly on account of its scarcity.—Bezoar bovinum, is a yellowish stone found in the ox's gall-bladder.—Human bezoars are stony substances found in the intestines of several persons, formed from the stones of plums, or other fruits, retained in the cœcum or other guts, and growing coated over, of which we have an instance given by Dr Cole, Phil. Trans. No 235.—Bezoar microcosmicum is the same with the human calculus; and is various in its degrees of hardness, as well as in its size and figure. It has been used in the place of the more costly sorts.—As to the bezoar hystericis, a concretion found in the gall-bladder of an Indian porcupine; and the German bezoar, or that found in mountain deer, especially on the Alps; these, not being stones, are more properly called by late writers egagrophile; the former consisting of woolly fibres, and a bitter friable matter, having neither laminae nor membranes; the latter being a ball of hair or herbs, or perhaps roots, compacted in the stomach of the animal.—They are all, as medicines, unworthy of regard.—The bezoar bovinum, or ox bezoar, is used by miniature-painters in several casts of yellow.