- Planaria (n.)
[Planaria 词源字典]
- flat worm-like animal, 1819, from Modern Latin (1776) noun use of fem. of Latin planarius, literally "on level ground" (here used to mean "flat"), from planum, planus "flat, level, even, plain" (see plane (n.1)). Related: Planarian.[Planaria etymology, Planaria origin, 英语词源]