(transitive) To write a monograph on (a subject). / (transitive, US) Of the FDA: to publish a standard that authorizes the use of (a substance).

Alternative spelling of sulfur monoxide

(inorganic chemistry) An unstable binary compound, SO, of sulfur and oxygen.

Knowing or using a single language; written or spoken in a single language.

a person who knows or uses only a single language; a monoglot

The act of monopolizing or the state of being monopolized.

(of sound reproduction) having a single channel; monaural (compare stereophonic) / (music) having a single melodic line and no harmony (compare polyphonic)

Play money. / (slang, often derogatory) Banknotes of foreign currency; especially those which are vibrant or flimsy.

Composed of, or relating to, a single plane (flat surface extending infinitely in all directions).

(aviation) An airplane that has a single pair of wings.