• (n.) A river tortoise; one of a group of tortoises (Potamites, or Trionychoidea) having a soft shell, webbed feet, and a sharp beak. See Trionyx. Found on http://thinkexist.com/dictionary/meaning/potamian/
Po·ta'mi·an noun [ Greek ... river.] (Zoology) A river tortoise; one of a group of tortoises ( Potamites , or Trionychoidea ) having a soft shell, webbed feet, and a sharp beak. See Trionyx . Found on http://www.encyclo.co.uk/webster/P/136