Definitions

1. noun

A surname of English origin, or a type of crater on Mars.

“The astronaut was named after Clyde Tombaugh, the discoverer of Pluto.”

2. proper noun

The full name of Clyde Tombaugh, an American astronomer.

“Clyde Tombaugh discovered Pluto in 1930.”

3. noun

A type of crater on Mars, similar to the one discovered by the 2001 Mars Odyssey.

“The Tombaugh Regio is one of the largest craters on Mars.”