Ru ‧ dolph, the Red-nosed Rein ‧ deer /ˌruːdɒlf ðə ˌred nəʊzd ˈreɪndɪəʳ $ ˌruːdɑːlf-/ BrE AmE
a character in a children's Christmas song. Rudolph is a ↑ reindeer (=a large grass-eating wild animal with large horns) who has a shiny red nose. The other reindeer think his nose looks silly, but ↑ Santa Claus asks him to help the other reindeer to pull his ↑ sleigh on a ↑ foggy night, because his bright nose helps them to see where they are going.:
Rudolph the red-nosed reindeer
Had a very shiny nose,
And if you ever saw it,
You would even say it glows.