n. [ Aëro- + siderite. ] (Meteor.) A mass of meteoric iron. [ 1913 Webster ]

n. [ Holo + siderite. ] (Min.) Meteoric iron; a meteorite consisting of metallic iron without stony matter. [ 1913 Webster ]

n. [ Meso- + siderite. ] (Min.) See the Note under Meteorite. [ 1913 Webster ]

n. [ Oligo- + siderite. ] (Min.) A meteorite characterized by the presence of but a small amount of metallic iron. [ 1913 Webster ]

n. [ Gr. fa`rmakon drug, poison + E. siderite. ] (Min.) A hydrous arsenate of iron occurring in green or yellowish green cubic crystals; cube ore. [ 1913 Webster ]

n. [ L. sideritis loadstone, Gr. &unr_;&unr_;&unr_;&unr_;, &unr_;&unr_;&unr_;&unr_;, of iron, from &unr_;&unr_;&unr_;&unr_; iron. ] 1. (Min.) (a) Carbonate of iron, an important ore of iron occuring generally in cleavable masses, but also in rhombohedral crystals. It is of a light yellowish brown color. Called also sparry iron, spathic iron. (b) A meteorite consisting solely of metallic iron. (c) An indigo-blue variety of quartz. (d) Formerly, magnetic iron ore, or loadstone. [ 1913 Webster ]

2. (Bot.) Any plant of the genus Sideritis; ironwort. [ 1913 Webster ]

n. [ Sphere + siderite. ] (Min.) Siderite occuring in spheroidal masses. [ 1913 Webster ]