Lewis & Short

pŏlītūra, ae, f. [1. polio],

  1. I. a furbishing, polishing, smoothing, working at, etc. (postAug.): chartae, Plin. 13, 12, 25, § 81: marmoris, id. 36, 6, 9, § 53: gemmarum (of the vine), id. 17, 26, 39, § 246: laevitas et politura corporum, Sen. Q. N. 7, 31, 4.
    Of a cobweb, Plin. 11, 24, 28, § 84.
    In plur., Vitr. 7, 1.
  2. II. Transf., of literary composition: videbimus quid parum recisum sit, quid non hujus recentis politurae, Sen. Ep. 100, 5.