Is 'bombast' English, or is it actually Latin?

'Bombast' is a word borrowed from Latin 'bombyx'. The word entered the English language some time around 1583.

bombast [noun] [1583]

Pretentious inflated speech or writing

See 'bombast' on the Loan Words Map

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Etymology: Middle English 'bombast' cotton padding, from Middle French 'bombace' from Medieval Latin 'bombac-, bombax' cotton, alteration of Latin 'bombyc-, bombyx' silkworm, silk, from Greek 'bombyk-, bombyx'

See more loan words from 1500s.