Anagrams of: OITRED_

• large powerful tractor; a large blade in front flattens areas of ground

• a light fitful sleep

• sleep lightly or for a short period of time

• Dextrorotatory.

• A scatterbrained person, especially a woman.

• of or relating to the null set (a set with no members)

• a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential

• a mathematical element that when added to another number yields the same number

• the point on a scale from which positive or negative numerical quantities can be measured

• the sight setting that will cause a projectile to hit the center of the target with no wind blowing

• indicating the absence of any or all units under consideration

• having no measurable or otherwise determinable value

• indicating an initial point or origin

• adjust (an instrument or device) to zero value

• adjust (as by firing under test conditions) the zero of (a gun)

• ostentatious display of elegance

• Swiss hotelier who created a chain of elegant hotels (1850-1918)

• an ostentatiously elegant hotel

• the hospital ward or clinic in which patients are detoxified

• treat for alcohol or drug dependence

• any compound of oxygen with another element or a radical

• the 26th letter of the Roman alphabet