Mab

Welsh term for "son."

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 Romeo: I dreamt a dream to-night.

 . . . . . . . . . . . . . . . . . . . . . . . . .

Mercutio: Oh then I see Queen Mab hath been with you:

She is the Fairies' midwife, and she comes

In shape no bigger than an agate-stone. . . .

    (Shakespeare, Romeo and Juliet, act 1, scene 4)