Source : Webster's Revised Unabridged Dictionary (1913)

Rut \Rut\, v. i. [imp. & p. p. {Rutted}; p. pr. & vb. n.
   {Rutting}.]
   To have a strong sexual impulse at the reproductive period;
   -- said of deer, cattle, etc.

Source : WordNet®

rut
     n 1: a groove or furrow (especially one in soft earth caused by
          wheels)
     2: a settled and monotonous routine that is hard to escape;
        "they fell into a conversational rut" [syn: {groove}]
     3: applies to nonhuman mammals: a state or period of heightened
        sexual arousal and activity [syn: {estrus}, {oestrus}, {heat}]
        [ant: {anestrus}]
     [also: {rutting}, {rutted}]

rut
     v 1: be in a state of sexual excitement; of male mammals
     2: hollow out in the form of a furrow or groove; "furrow soil"
        [syn: {furrow}, {groove}]
     [also: {rutting}, {rutted}]

rutting
     See {rut}