SNAP-Dragon, or Calvesnout: A genus of the angiospermia order, belonging to the didynamia class of plants; and in the natural method ranking under the 40th order, Perforatae. The essential characters are these: The calyx consists of five leaves; the basis of the corolla is bent backwards, and furnished with pectoria; the capsule is bilocular. There are 14 species of the antirrhinum, 10 of which are natives of Britain, viz. the cymbalaria, or ivy-leaved toad-grass; the elatine, or sharp-pointed fiellin; the spurium, or round-leaved fiellin; the arvense, or corn blue toad-flax; the repens, or creeping toad-flax; the monospermum, or sweet-smelling toad-flax; the linaria, or common yellow toad-flax; the minus, or leaf toad-flax; the majus, or greater snapdragon; and the orontium, or leaf snap-dragon. The linaria is said to be cathartic, and diuretic; but it is not used in the shops.