TICK n.
The cover, or case, of a bed, mattress, etc., which contains the straw, feathers, hair, or other filling.
UNION n.
the first, or second, intention, under Intention. -- Union down (Naut.), a signal of distress at sea made by reversing the flag, or turning its union downward. -- Union jack. (Naut.) See Jack, n., 10. -- Union joint. (Mech.) (a) A joint formed by means of a union. (b) A piece of pipe made in the form of the letter…
UNIT n.
hrough a unit distance against gravitation. See Erg, Foot Pound, Kilogrammeter. -- Unit stress (Mech. Physics), stress per unit of area; intensity of stress. It is expressed in ounces, pounds, tons, etc., per square inch, square foot, or square yard, etc., or in atmospheres, or inches of mercury or water, or the like.…