Meaning

noun the right side of a ship or aircraft to someone who is aboard and facing the bow or nose

verb turn to the right, of helms or rudders

adjective located on the right side of a ship or aircraft

originFrom Middle English sterbord, stere-bourd, stere-burd, from Old English stēorbord, from Proto-West Germanic *steurubord, equivalent to steer + board (“side (of a ship)”), referring to ancient ships with the steering oar set to the right (to accommodate right-handed crew). Ships had to dock on their left (port) side because the steering oar on the right would get in the way, which is how the left…

Etymology from Wiktionary, CC BY-SA 3.0