MICROMETER n.
meter caliper or gauge (Mech.), a caliper or gauge with a micrometer screw, for measuring dimensions with great accuracy. -- Micrometer head, the head of a micrometer screw. -- Micrometer microscope, a compound microscope combined with a filar micrometer, used chiefly for reading and subdividing the divisions of larg…
MUD n.
öl.), the fellbender. -- Mud drum (Steam Boilers), a drum beneath a boiler, into which sediment and mud in the water can settle for removal. -- Mud eel (Zoöl.), a long, slender, aquatic amphibian (Siren lacertina), found in the Southern United States. It has persistent external gills and only the anterior pair of leg…
MUSTARD n.
A powder or a paste made from the seeds of black or white mustard, used as a condiment and a rubefacient. Taken internally it is stimulant and diuretic, and in large doses is emetic. Mustard oil (Chem.), a substance obtained from mustard, as a transparent, volatile and intensely pungent oil. The name is also extended t…