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macrocyclic

[mak-roh-sahy-klik, -sik-lik]
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adjective Chemistry.
  1. having a ring structure consisting of more than 12 atoms.
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Origin of macrocyclic

First recorded in 1945–50; macro- + cyclic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018