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 most commonly {reenforced
concrete}.
[Webster 1913 Suppl. +PJC]