Webster's Revised Unabridged Dictionary · 1913

Bombast

Bombast (bom"bȧst or bum"bȧst; 277) , noun

[Old French bombace cotton, Late Latin bombax cotton, bombasium a doublet of cotton; hence, padding, wadding, fustian. See Bombazine.]

1.
Originally, cotton, or cotton wool. [Obsolete]
A candle with a wick of bombast. — Lupton
2.
Cotton, or any soft, fibrous material, used as stuffing for garments; stuffing; padding. [Obsolete]
How now, my sweet creature of bombast! — Shakespeare
Doublets, stuffed with four, five, or six pounds of bombast at least. — Stubbes
3.
Figuratively: High-sounding words; an inflated style; language above the dignity of the occasion; fustian.
Yet noisy bombast carefully avoid. — Dryden

Bombast , adjective

High-sounding; inflated; big without meaning; magniloquent; bombastic.
[He] evades them with a bombast circumstance, Horribly stuffed with epithets of war. — Shakespeare
Nor a tall metaphor in bombast way. — Cowley

Bombast (bom*bȧst" or bum*bȧst") , transitive verb

To swell or fill out; to pad; to inflate. [Obsolete]
Not bombasted with words vain ticklish ears to feed. — Drayton