arc-cosine: the function the value of which for a given argument between –1 and 1 is the angle in radians (between 0 and π), the cosine of which is that argument: the inverse of the cosine function

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  • Arcella

    a genus of freshwater, ameboid protozoa that secrete a hard, umbrellalike sh-ll having a single opening through which the pseudopodia extend. historical examples dujardin points out very clearly the ident-ty of structure between organisms like amœbæ and such forms as difflugia and arcella. the ocean world: louis figuier

  • Arced

    geometry. any unbroken part of the circ-mference of a circle or other curved line. also called electric arc. electricity. a luminous bridge formed in a gap between two electrodes. compare 1 (def 2). astronomy. the part of a circle representing the apparent course of a heavenly body. anything bow-shaped. to form an . to move […]

  • Arcesilaus

    316–241 b.c, greek philosopher. historical examples arcesilaus attacked especially their doctrine of the criterion of truth. a critical history of greek philosophy w. t. stace seneca is of opinion, that he was suspected to be as much given to wine as arcesilaus. ebrietatis encomium boniface oinophilus the same thing, but not designed by him, despatched […]

  • Arcesius

    a son of zeus and euryodia, father of laertes, and grandfather of odysseus.

  • Archbanc

    . a bench or settle of the medieval and renaissance periods, wide enough for several persons and having a seat with a chest beneath, arms at the ends, and a high back.

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