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Of or relating to the order Polycladida of turbellarian flatworms, having a main intestine with more than four branches.
A polyclad flatworm.
Late 19th century; earliest use found in George Rolleston (1829–1881), physician and physiologist. From polyclad- (in scientific Latin Polycladidea or Polycladida, order (or suborder) names; from poly- + ancient Greek κλάδος branch + scientific Latin -idea and -ida, respectively: see -id).