That is the correct spelling of "trampoline" (equipment on which you bounce, for exercise or sport).
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The word meaning "a gymnastic apparatus" is trampoline.
There is no direct synonym for trampoline, the gymnastic bouncing device usually made with canvas and springs.
The pronoun for the noun trampoline is 'it'. For plural form, trampolines, the pronoun 'they' is used as a subject and 'them' as the object of a sentence.
Excited as a squirrel on a trampoline
There are three syllables. Tramp-o-line.