Medical Definition of frog
1: any of various smooth-skinned web-footed largely aquatic tailless agile leaping amphibians (as of the suborder Diplasiocoela)
2: the triangular elastic horny pad in the middle of the sole of the foot of a horse
3: a condition in the throat that produces hoarseness <had a frog in his throat>
Seen and Heard
What made you want to look up frog? Please tell us where you read or heard it (including the quote, if possible).