wa·ter·cress 
(wôtər-krĕs′, wŏtər-)
(wôtər-krĕs′, wŏtər-)n.
1. A perennial aquatic Eurasian herb (Nasturtium officinale) of the mustard family, having pungent leaves used in salads and as a garnish.
2. Any of several related aquatic plants.
- retrogression
- retrogressive
- retrogressively
- retrolental
- retronym
- retroocular
- retroperitoneal
- retropharyngeal
- retrorocket
- retrorse
- retrorsely
- retrospect
- retrospection
- retrospective
- retrospectively
- retrotransposon
- retroussé
- retroversion
- retroviral
- retrovirologist
- retrovirology
- retrovirus
- retry
- retsina
- return