Source : Webster's Revised Unabridged Dictionary (1913)

Ferro-concrete \Fer"ro-con"crete\, n. (Arch. & Engin.)
   Concrete strengthened by a core or foundation skeleton of
   iron or steel bars, strips, etc. Floors, columns, piles,
   water pipes, etc., have been successfully made of it. Called
   also {armored concrete steel}, and {re["e]nforced concrete}.