phalanx Look up phalanx at Dictionary.com
1553, from Gk. phalanx (gen. phalangos) "line of battle, battle array," also "finger or toe bone," originally "round piece of wood, trunk, log," of unknown origin, perhaps from PIE base *bhelg- "plank, beam" (cf. O.E. balca "balk;" see balk). In anatomy, originally the whole row of finger joints, which fit together like infantry in close order. Fig. sense of "number of persons banded together in a common cause" is attested from 1600 (cf. Sp. Falangist, member of a fascist organization founded in 1933).