Lewis & Short

flŭĭdus (access. form, flŭvĭdus, Lucr. 2, 452; 464 sq.; Sedul. Carm. 4, 186; Sen. Ep. 58, 24), a, um, adj. [fluo], flowing, fluid, moist (mostly poet. and in post-Aug. prose; not in Cic. or Caes.).

  1. I. Lit.: corpus, Lucr. 2, 452: quid tam contrarium est quam terrenum fluido? Col. 8, 16, 1: liquor, Verg. G. 3, 484: cruor, id. A. 3, 663; Ov. M. 4, 482; cf.: aspiciam fluidos humano sanguine rictus, id. ib. 14, 168: alvus, Ser. Samm. 29 fin.
  2. II. Transf.
    1. A. In opposition to solid or firm, soft, slack, lax, languid (syn.: fluxus, languidus): lacerti, Ov. M. 15, 231; cf.: labor et aestus mollia et fluida Gallorum corpora decedere pugna coëgit, Liv. 34, 47, 5: caro, Plin. 9, 30, 50, § 95: vestis, flowing, loose, Just. 41, 2; Sen. Oed. 422.
    2. * B. Act., dissolving: calor, Ov. M. 15, 362.