12-letter words containing mu
- wing formula — a numerical representation of the relative lengths of the primary feathers of a bird's wing, used in identifying similar species, as flycatchers.
- 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.