A reindeer is a deer of the far north with branching antlers. A herd of reindeer, reindeer moss, pull the sleigh.
It is the only deer in which both sexes grow antlers, and the males drop theirs in early winter — so the team pulling the sleigh at Christmas would all be female. In North America the wild ones are called caribou and the herded ones reindeer. The plural has no s.
1nounreindeerA deer of the far north with branching antlers.
“In Lapland, tourists can ride in sleighs pulled by reindeer.”
reindeer is an animal.
Old Norse hreindyri is hreinn, the animal, plus dyr, a beast. The deer part was already there in Norse.
Old Norse
hreindýri — reindeer
Middle English
reyndere
English, today
reindeer
Built from
From Middle English reyndere, reynder, rayne-dere, from Old Norse hreindýri (“reindeer”), from hreinn (“reindeer”) + dýr (“animal”). Compare Dutch rendier (“reindeer”), German Rentier (“reindeer”), Swedish rendjur (“reindeer”), Danish rensdyr (“reindeer”) and French renne (“reindeer”). Related also to displaced Old English hrān (“reindeer”). Unrelated to rein.
Etymology from Wiktionary, CC BY-SA