the.com/epoxy

means A synthetic resin that hardens into a strong adhesive or coating when mixed with a curing agent.

from From Greek 'epi-' (upon, over) plus 'oxy-' (from oxygen), referring to the epoxide chemical group — a triangular ring of two carbon atoms and one oxygen atom that gives the resin its reactive punch. Chemists in the 1930s figured out how to turn this strained, high-energy ring into tough plastics and adhesives, and the industrial name simply describes the molecular structure doing the work: an oxygen bridge sitting 'upon' the carbons.