Anagrams of: ORTENO_

• a colorless gas (O3) soluble in alkalis and cold water; a strong oxidizing agent; can be produced by electric discharge in oxygen or by the action of ultraviolet radiation on oxygen in the stratosphere (where it acts as a screen for ultraviolet radiation)

• 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)

• a locally circumscribed place characterized by some distinctive features

• any of the regions of the surface of the Earth loosely divided according to latitude or longitude

• an area or region distinguished from adjacent parts by a distinctive feature or characteristic

• (anatomy) any encircling or beltlike structure

• regulate housing in; of certain areas of towns

• separate or apportion into sections

• any thick, viscous matter

• the process of seeping

• pass gradually or leak through or as if through small openings

• release (a liquid) in drops or small quantities

• pasta shaped like pearls of barley; frequently prepared with lamb in Greek cuisine

• the facility where wild animals are housed for exhibition