Clyde Tombaugh Clyde Tombaugh /ˈklaɪd tɒmˈbɔː/

noun

1. United States astronomer who discovered the planet Pluto (1906-1997)  ( Clyde Tombaugh , Clyde William Tombaugh , Tombaugh )
   United States astronomer who discovered the planet Pluto (1906-1997)