Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

rētae, ārum, f., trees standing on the bank or in the bed of a stream, acc. to Gabius ap. Gell. 11, 17, 4.
From this is said to come the verb retare, to clear, free from obstructions, in an old edict: flumina retanda; v. Gell. l. l.