"of or pertaining to a marsh or marshes," 1803, with -al (1) + stem of Latin palus "a swamp, a fen, a marsh," from PIE *pelkiz- (source also of Sanskrit palvala- "pond, pool;" Old Prussian pelky "marsh," Lithuanian pėlkė "marsh," Latvian pelce "puddle"). Alternative formations paludine (1832, from French) and paludinous (1866) are later in English.
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