noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   a chemical agent added to a material, such as rocket propellant, to make it opaque
2. 2
   an extraneous agent or vehicle which, intentionally otherwise, makes something opaque figuratively

Etymology

From opacify + -er.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.