Lewis & Short

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dĕcussis, is (also decus, i, a mutilated form used by the Agrimensores, p. 231, 243, and 265, ed. Goes.), m. [decem-as].

  1. I. The number ten: ex singularibus rebus, quae μονάδες apud Graecos dicuntur perficitur decussis, Vitr. 3, 1 (cf. the art. as, no. I.).
    Hence, * decussis sexis, or in one word, dĕcussissexis, the number sixteen, Vitr. 3, 1, 8.
    1. B. Because the Roman numeral sign for ten was X, decussis was used to denote the intersection of two lines in the form of a cross: regula figitur in primo decussis puncto, Vitr. 10, 11; Plin. 18, 34, 77, § 331. Cf. decusso and its derivatives.
  2. II. (Acc. to as, no. II.) Ten asses; as a Roman coin, a ten-as piece, Varr. L. L. 5, § 170; Lucil. ib. 9, § 81 Müll.; Stat. Silv. 4, 9, 9; Fest. p. 237, 20 Müll.

dēcussus, a, um, Part., v. follg. art.

1. dē-cŭtĭo, cussi, cussum, 3, v. a. [quatio], to shake off, strike or beat off, cast off (not freq. till after the Aug. per.; not in Caes. or Cic.).

  1. I. Lit.: decussa Cydonia ramo, Prop. 3, 13 (4, 12), 27: lilia, Ov. F. 2, 707: summa papaverum capita baculo, Liv. 1, 54: olivas, Plin. 15, 3, 3, § 11: mella foliis, Verg. G. 1, 131: honorem (poet. for frondem) silvis, id. ib. 2, 404: rorem, id. ib. 4, 12: uncum mento fixum, Prop. 4, 1, 141 (5, 1, 141 M.): Victoria fulmine icta decussaque, struck down, Liv. 26, 23; cf. id. 25, 7: pinnas muri, id. 40, 45; 44, 8; cf.: partem muri arietibus, id. 32, 17: muros ariete, id. 33, 17: nidos avium sagittis, Plin. 10, 33, 50, § 97: collem decusso Labieni praesidio celeriter occupaverunt, dislodged, Auct. B. Afr. 50 fin.; cf.: decussus Capitolio, Val. Max. 1, 4, 2.
    In comic lang.: ex armario argenti tantum, quantum, etc., to shake out, Plaut. Epid. 2, 3, 4.
  2. II. Trop.: cetera aetate jam sunt decussa, shaken off, thrown aside, Cael. ap. Cic. Fam. 8, 13, 1 (al. decursa): ad id non accedes, ex quo tibi aliquid decuti doles, wrested, Sen. Cons. ad Marc. 18 8 fin.