The Collaborative International Dictionary of English v.0.48:

Sane \Sane\, a. [L. sanus; cf. Gr. ?, ?, safe, sound. Cf.
   Sound, a.]
   1. Being in a healthy condition; not deranged; acting
      rationally; -- said of the mind.
      [1913 Webster]

   2. Mentally sound; possessing a rational mind; having the
      mental faculties in such condition as to be able to
      anticipate and judge of the effect of one's actions in an
      ordinary maner; -- said of persons.
      [1913 Webster]

   Syn: Sound; healthy; underanged; unbroken.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pentosan \Pen"to*san\, n. Also -sane \-sane\ [From Pentose.]
   (Chem.)
   One of a class of substances (complex carbohydrates widely
   distributed in plants, as in fruits, gums, woods, hay, etc.)
   which yield pentoses on hydrolysis.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

sane
    adj 1: mentally healthy; free from mental disorder; "appears to
           be completely sane" [ant: insane]
    2: marked by sound judgment; "sane nuclear policy" [syn:
       reasonable, sane]