garden plant, 1570s, from snap (n.) + dragon. So called from fancied resemblance of antirrhinum flowers to a dragon's mouth. As the name of a Christmas game of plucking raisins from burning brandy and eating them alight, from 1704.
snake oil
snakehead
snakestone
snaky
snap
snapdragon
snape
snapper
snappish
snappy
snapshot