Source : Webster's Revised Unabridged Dictionary (1913)

Sinistrin \Sin"is*trin\ (s[i^]n"[i^]s*tr[i^]n), n. [L. sinister
   left.] (Chem.)
   A mucilaginous carbohydrate, resembling achro["o]dextrin,
   extracted from squill as a colorless amorphous substance; --
   so called because it is levorotatory.