steamship (n.)

Old English steam "vapor, fume, water in a gaseous state," from Proto-Germanic *staumaz (source also of Dutch stoom "steam"), of unknown origin. Meaning "vapor of boiling water used to drive an engine" is from 1690s, hence steam age (1828) and many figurative uses, such as let off steam (1831, literal), blow off steam (1857, figurative), full-steam (1878), get up steam (1887, figurative). Steam heat is from 1820s in thermodynamics; as a method of temperature control from 1904.

We have given her six months to consider the matter, and in this steam age of the world, no woman ought to require a longer time to make up her mind. [Sarah Josepha Hale, "Sketches of American Character," 1828]

Old English scip "ship, boat," from Proto-Germanic *skipa- (source also of Old Norse, Old Saxon, Old Frisian, Gothic skip, Danish skib, Swedish skepp, Middle Dutch scip, Dutch schip, Old High German skif, German Schiff), "Germanic noun of obscure origin" [Watkins]. Others suggest perhaps originally "tree cut out or hollowed out," and derive it from PIE root *skei- "to cut, split" (see schizo-).

Now a vessel of considerable size, adapted to navigation; the Old English word was used for small craft as well, and definitions changed over time; in 19c., distinct from a boat in having a bowsprit and three masts, each with a lower, top, and topgallant mast. French esquif, Italian schifo are Germanic loan-words.

Phrase ships that pass in the night is from Longfellow's poem "Elizabeth" in "Tales of a Wayside Inn" (1863). Figurative use of nautical runs a tight ship (i.e., one that does not leak) is attested from 1965.