I am interested in early versions of English, and while reading I've often encountered the word wottest being used. For example:
Then he said, "Galahad, son, wottest thou what I hold between my hands?"
"Nay," said Sir Galahad, "but if ye tell me."
"This is," said he, "the holy dish wherein I eat the lamb on Shrove-Thursday... Malory's History of King Arthur and the Quest of the Holy Grail, Sir Thomas Mallory
Etymology Online has no entry for "wottest".
My questions are these: What does it mean? When do we use it (if it is still used today)?