\Tur"bi*nal\, a. [L. turbo, turben, -inis, a top,
whirl.] (Anat.)
Rolled in a spiral; scroll-like; turbinate; -- applied to the
thin, plicated, bony or cartilaginous plates which support
the olfactory and mucous membranes of the nasal chambers.
Note: There are usually several of these plates in each nasal
      chamber. The upper ones, connected directly with the
      ethmoid bone, are called ethmoturbinals, and the lower,
      connected with the maxill[ae], maxillo-turbinals.
      Incurved portions of the wall of the nasal chamber are
      sometimes called pseudoturbinals, to distinguish them
      from the true turbinals which are free outgrowths into
      the chambers.

\Tur"bi*nal\, n. (Anat.)
A turbinal bone or cartilage.