Definition of "mauther"

KAS. Ay, I know -- Away, [TO HIS SISTER.] you talk like a foolish mauther.

c. 1610, Ben Jonson, The Alchemist, Act 4

Cleave to a tight ship, my boy, as long as the wind blaeth, and while she lives upon the waters, she'll aye be a mauther to thee.

1823, Thomas Campbell, Samuel Carter Hall, Edward Bulwer Lytton, Colburn's new monthly magazine, volume 7, page 230