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rete (n.)

late 14c., "open-work metal plate affixed to an astrolabe," from Latin rete "net," a word of uncertain origin, perhaps related to Lithuanian rėtis "sieve," or perhaps a loan-word from a non-IE language. The main modern sense is anatomical, "vascular network, plexus of blood vessels" (1540s). Plural is retia. Related: Retial.

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Definitions of rete from WordNet

rete (n.)
a network of intersecting blood vessels or intersecting nerves or intersecting lymph vessels;
Synonyms: plexus
From wordnet.princeton.edu