He added an "e" to trampolin, the Spanish word for diving board or springboard.    From Wordnik.com.  [Fore, right!] Reference

The name trampoline comes from the Spanish "trampolin," or diving board.    From Wordnik.com.  [The Times of India] Reference

Ony is food on the mountain is all that fast, but you burn on the runway. trampolin mit netz.    From Wordnik.com.  [Why You Should Care if Cattle Get Fourth-Generation Cephalosporins - The Panda's Thumb] Reference

It was there that he heard the Spanish word for diving board: el trampolin.    From Wordnik.com.  [NYT > Home Page] Reference

"trampolin," for "diving board" or "springboard.".    From Wordnik.com.  [TheState.com: The Buzz] Reference