The Collaborative International Dictionary of English v.0.48:

Tumid \Tu"mid\, a. [L. tumidus, fr. tumere to swell; cf. Skr.
   tumra strong, fat. Cf. Thumb.]
   1. Swelled, enlarged, or distended; as, a tumid leg; tumid
      flesh.
      [1913 Webster]

   2. Rising above the level; protuberant.
      [1913 Webster]

            So high as heaved the tumid hills.    --Milton.
      [1913 Webster]

   3. Swelling in sound or sense; pompous; puffy; inflated;
      bombastic; falsely sublime; turgid; as, a tumid
      expression; a tumid style.
      [1913 Webster] -- Tu"mid*ly, adv. -- Tu"mid*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

tumidness
    n 1: slight swelling of an organ or part [syn: tumidity,
         tumidness]