FLANK n.
nemy's position, in order to turn it or to attack him on the flank. -- Flank movement, a change of march by an army, or portion of one, in order to turn one or both wings of the enemy, or to take up a new position. -- Flanks of a frontier, salient points in a national boundary, strengthened to protect the frontier ag…
FLY v.
th a qualifying word; as, a door flies open; a bomb flies apart. To fly about (Naut.), to change frequently in a short time; -- said of the wind. -- To fly around, to move about in haste. [Colloq.] -- To fly at, to spring toward; to rush on; to attack suddenly. -- To fly in the face of, to insult; to assail; to set a…
FOCUS n.
om a near object; -- so called because the positions of the object and its image are interchangeable. -- Focus tube (Phys.), a vacuum tube for Roentgen rays in which the cathode rays are focused upon the anticathode, for intensifying the effect. -- Principal, or Solar, focus (Opt.), the focus for parallel rays.…
FORCE n.
Any action between two bodies which changes, or tends to change, their relative condition as to rest or motion; or, more generally, which changes, or tends to change, any physical relation between them, whether mechanical, thermal, chemical, electrical, magnetic, or of any other kind; as, the force of gravity; cohesive…
FOREIGN a.
oints of view, the different States of the United States are foreign to each other. See Exchange, n., 4. Kent. Story. -- Foreign body (Med.), a substance occurring in any part of the body where it does not belong, and usually introduced from without. -- Foreign office, that department of the government of Great Brita…