planarian
Concise Oxford English Dictionary © 2008 Oxford University Press:
planarian /pləˈnɛːrɪən/
▶noun Zoology a free-living aquatic flatworm. [Order Tricladida.]
– origin C19: from mod. L. Planaria (genus name), fem. of L. planarius ‘lying flat’.
'planarian' also found in these Oxford entries:

