planarian
/pləˈneərɪən/noun
1- a free-living flatworm which has a three-branched intestine and a tubular pharynx, typically located halfway down the body涡虫。
1.1
- Order Tricladida, class Turbellaria: Planaria and other genera.三肠目, 涡虫纲：涡虫属及其他属。
词源
mid 19th cent.: from modern Latin Planaria （feminine of Latin planarius 'lying flat'） + -IAN.