Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
‡ retricibus cum ait Cato, aquam eo nomine significat, quā horti irrigantur, Fest. pp. 282 and 283 Müll. (a canal, aqueduct; perh. kindr. with ῤέεθρον, ῤεῖθρον).