/ Dictionary / Index M multistep hydroplane: Meaning and Definition of Find definitions for: mul'ti•step hy'droplane Pronunciation: (mul'ti-step"), [key] — Naut. Naut. a motorship having a flat bottom built as a series of planes inclined forward, the ship planing on each from stem to stern as its speed increases. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. multistate multistory Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language