Lewis & Short

fullōnĭus, a, um, adj. [fullo], of or belonging to fullers.

  1. I. Adj.: ars, the art of fulling, Plin. 7, 56, 57, § 196: creta, fuller’s earth, id. 17, 8, 4, § 46: aenae, id. 24, 13, 68, § 111: saltus, a jumping in fulling, Sen. Ep. 15.
    Comically: nisi lenoni munus hodie misero, Cras mihi potandus fructus (perh. fucus) est fullonius, to-morrow I must swallow ink (acc. to others, must let myself be stamped upon), Plaut. Ps. 3, 1, 15.
  2. II. Subst.
          1. (α) fullōnium, ĭi, n. (= fullonica, II. B.), a fuller’s shop, Amm. 14, 11, 31.
          2. (β) fullōnia, ae, f., the fuller’s trade (sc. ars): si non didicisti fulloniam, non mirandumst, Plaut. As. 5, 2, 57 Fleck. (al. fullonicam).