12-letter words containing a, u, m, b
- unreformable — not able to be reformed or reclaimed
- unremarkable — notably or conspicuously unusual; extraordinary: a remarkable change.
- unremarkably — notably or conspicuously unusual; extraordinary: a remarkable change.
- unremediable — capable of being remedied.
- unremittable — to transmit or send (money, a check, etc.) to a person or place, usually in payment.
- unsublimated — Psychology. to divert the energy of (a sexual or other biological impulse) from its immediate goal to one of a more acceptable social, moral, or aesthetic nature or use.
- vacuum brake — a brake system, used on British and many overseas railways, in which the brake is held off by a vacuum on one side of the brake-operating cylinder. If the vacuum is destroyed by controlled leakage of air or a disruptive emergency, the brake is applied. It is now largely superseded by the Westinghouse brake system
- williamsburg — a city in SE Virginia: colonial capital of Virginia; now restored to its original pre-Revolutionary style.
- xylobalsamum — the dried, fragrant wood of the Balsamodendron gileadense that produces resin known as Balm of Gilead
- zebra mussel — a small striped freshwater mussel from NE Europe, Dreissena polymorpha: introduced to the Great Lakes in the 1980s and deleteriously affecting water pipes, other fauna, etc.