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frog's-bit

American  
[frogz-bit, frawgz-] / ˈfrɒgzˌbɪt, ˈfrɔgz- /

noun

  1. an aquatic, floating plant, Hydrocharis morsus-ranae, of Eurasia, having thick, roundish, spongy leaves.

  2. an aquatic, floating plant, Limnobium spongia, of tropical America, having reddish-brown spotted, oblong, heart-shaped, or ovate leaves.


Etymology

Origin of frog's-bit

First recorded in 1570–80