adj

• (of a nose) Flat and broad, with the end slightly turned up.
  "It was even less easy to fix the impression in the case of the man at the right end of the table, who, to say truth, was as commonplace a person as could be seen anywhere, with a round, brown-haired head and a round snub nose, but also clad in clerical black, of a stricter cut."
• (mathematics, of a polyhedron) Derived from a simpler polyhedron by the addition of extra triangular faces.

noun

• (obsolete) A knot; a protuberance; a snag.
  "[A club] with ragged snubs and knotty grain."

verb

• (transitive) To slight, ignore or behave coldly toward someone.
  "When, therefore, the First Secretary sounded him as to the expediency of some step in the direction of a firmer political combination than that at present existing,—by which of course was meant the dethronement of the present Prime Minister,—Mr. Roby had snubbed him!"
• (transitive) To turn down insultingly; to dismiss.
  "He snubbed my offer of help."
• (transitive) To check; to reprimand.
• (transitive) To stub out (a cigarette etc).