Yes, xi is in the scrabble dictionary

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Xi Definition

noun

See xi baryon.
from The American Heritage Dictionary of the English Language, 4th Edition
The 14th letter of the Greek alphabet. See Table at alphabet.
from The American Heritage Dictionary of the English Language, 4th Edition
The 14th letter of the Greek alphabet.
from Free Scrabble Dictionary
The fourteenth letter of the Greek alphabet (Ξ, ξ), transliterated as ‘x’.
from Free Scrabble Dictionary

geographical name

River 300 (483 ) China in Guangxi Zhuangzu & Guangdong flowing into S. China Sea.
from Free Scrabble Dictionary

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Points

xi

9

2 letter words with XI

Points

xi

9

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