Is Zad a scabble word?

Excuse me, but I'm curious about something. I've come across the word "Zad" recently and I'm wondering if it's a legitimate Scrabble word. I'm no Scrabble expert, but I've played a fair bit and I'm not sure I've ever seen "Zad" on the board before. Could you enlighten me on whether it's an acceptable Scrabble word, and if so, what its point value might be? I'd appreciate your help in clarifying this matter.