What is "celeborn"

Celeborn (pronounced with a hard c as in cat; ) is a fictional character in J.R.R. Tolkien's Middle-earth legendarium. He appears in The Lord of the Rings as the Elven husband of Galadriel, Lord of the Galadhrim, and co-ruler along with Galadriel of Lothlórien. He was the father of Celebrían (the wife of Elrond), and thus the grandfather of Arwen Evenstar and her older brothers Elladan and Elrohir. He was also a kinsman of the First Age Elven King Thingol. Celeborn means "(tall) silver tree" in Tolkien's invented language of Sindarin.

He is also referred to as Lord of Lothlórien or Lord of the Wood interchangeably. Within Lothlórien itself he is called simply Lord Celeborn or The Lord (more often with Galadriel as The Lord and Lady). He is called Celeborn the Wise by Galadriel.

Celeborn is also the name of the White Tree that flourished in Tol Eressëa. It was a seeding of the tree Galathilion, which in turn was made by Yavanna in the image of Telperion, the elder of the Two Trees of Valinor. Celeborn was an ancestor to the White Trees of Númenor and of Gondor.