FERRO-CONCRETE n.
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 reënforced concrete.
FISSION n.
division, consisting of gradual division or cleavage of the into two parts, each of which then becomes a separate and independent organisms; as when a cell in an animal or plant, or its germ, undergoes a spontaneous division, and the parts again subdivide. See Segmentation, and Cell division, under Division.…
FLANK n.
up a new position. -- Flanks of a frontier, salient points in a national boundary, strengthened to protect the frontier against hostile incursion. -- Flank patrol, detachments acting independently of the column of an army, but patrolling along its flanks, to secure it against surprise and to observe the movements of…