underdensity means the condition or extent of being underdense. Lexicurio rates it Rare gem — a strength score of 82 out of 100.
Etymology
From under- + density.
noun
- The condition or extent of being underdense.“In this paper we use high-resolution hydrodynamical cosmological simulations to compare the halo and stellar mass growth of galaxies in a large-scale overdensity to those in a large-scale underdensity (on scales of about 20 Mpc).”