Source : Webster's Revised Unabridged Dictionary (1913)

Stela \Ste"la\, n.; pl. {Stel[ae]}. [L., from Gr. ? a post, an
   upright stone.] (Gr. Antiq.)
   A small column or pillar, used as a monument, milestone, etc.

Source : WordNet®

stela
     n : an ancient upright stone slab bearing markings [syn: {stele}]