BEN is a 3 letter word that starts with B.

1. \Ben\, Ben nut \Ben" nut`\ . [Ar. b[=a]n, name of the tree.]
   (Bot.)
   The seed of one or more species of moringa; as, oil of ben.
   See {Moringa}.
   
   

2. \Ben\, adv. & prep. [AS. binnan; pref. be- by + innan
   within, in in.]
   Within; in; in or into the interior; toward the inner
   apartment. [Scot.]
   
   

3. \Ben\, n. [See {Ben}, adv.]
   The inner or principal room in a hut or house of two rooms;
   -- opposed to {but}, the outer apartment. [Scot.]
   
   

4. \Ben\
   An old form of the pl. indic. pr. of {Be}. [Obs.]