Definition of polyarch in US English:

polyarch

adjective

Botany
  • Of xylem or woody tissue: arising from several points of origin, having many strands of protoxylem.

Origin

Late 19th century; earliest use found in Frederic Bower (1855–1948), botanist. From German polyarch from poly- + -arch.

Pronunciation

polyarch

/ˈpɒlɪɑːk/