plexus

Concise Oxford English Dictionary © 2008 Oxford University Press:
plexus

▶noun (pl. same or plexuses)

• 1 Anatomy a network of nerves or vessels in the body.

• 2 an intricate network or web-like formation.

– derivatives
plexiform adjective.

– origin C17: from L., lit. ‘plaited formation’, past part. of plectere ‘to plait’.