Is MY a valid Scrabble word?

Yes. MY is valid in Collins Scrabble Words 2024, the word list used for Scrabble in the UK.

What MY means

• determiner - First-person singular possessive determiner. See Appendix:Possessive#English.
• interjection - Used to express surprise, shock or amazement.
• noun - Symbol for megayear(s).
• pronoun - Alternative letter-case form of my often used when speaking as God or another important figure who is understood from context.

Definitions come from Wiktionary via kaikki.org, shortened to fit, and are used under CC BY-SA 4.0.

Gramlet is a daily word game played with the same Collins list. Play today's board.