A slattern.
"The doctor explained that the new treatment uses a mab to target and destroy the cancer cells specifically."
Abbreviation of monoclonal antibody.
To dress untidily.
"After rolling out of bed, he felt too lazy to fix his clothes and decided just to mab for the morning commute."
A moon of Uranus
"The telescope finally caught a glimpse of Mab, one of Uranus's faintest moons, drifting silently through the dark sky."