Anagrams of: RETROVIR_

• a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face

• a brim that projects to the front to shade the eyes

• the shape of something rotating rapidly

• a powerful circular current of water (usually the result of conflicting tides)

• a style of jazz played by big bands popular in the 1930s; flowing rhythms but less complex than later styles of jazz

• dance to jive music; dance the jive

• 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

• cause annoyance in; disturb, especially by minor irritations

• disturb the peace of mind of; afflict with mental agitation or distress

• change the arrangement or position of

• subject to prolonged examination, discussion, or deliberation

• be a mystery or bewildering to

• the sound made by the vibration of vocal folds modified by the resonance of the vocal tract

• a sandal attached to the foot by a thong over the toes