The Collaborative International Dictionary of English v.0.48:

Phalanx \Pha"lanx\, n.; pl. Phalanxes, L. Phalanges. [L.,
   from Gr. fa`lagx.]
   1. (Gr. Antiq.) A body of heavy-armed infantry formed in
      ranks and files close and deep. There were several
      different arrangements, the phalanx varying in depth from
      four to twenty-five or more ranks of men. "In cubic
      phalanx firm advanced." --Milton.
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            The Grecian phalanx, moveless as a tower. --Pope.
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   2. Any body of troops or men formed in close array, or any
      combination of people distinguished for firmness and
      solidity of a union.
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            At present they formed a united phalanx. --Macaulay.
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            The sheep recumbent, and the sheep that grazed,
            All huddling into phalanx, stood and gazed.
                                                  --Cowper.
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   3. A Fourierite community; a phalanstery.
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   4. (Anat.) One of the digital bones of the hand or foot,
      beyond the metacarpus or metatarsus; an internode.
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   5. [pl. Phalanges.] (Bot.) A group or bundle of stamens, as
      in polyadelphous flowers.
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The Collaborative International Dictionary of English v.0.48:

Phalanges \Pha*lan"ges\, n.,
   pl. of Phalanx.
   [1913 Webster] Phalangial