¹ Source: wiktionary.com
Definition of Planarians
1. planarian [n] - See also: planarian
Medical Definition of Planarians
1. Nonparasitic free-living flatworms of the class turbellaria. The most common genera are dugesia, formerly planaria, which lives in water, and bipalium, which lives on land. Geoplana occurs in south america and california. (12 Dec 1998)