thickening

 
Pronunciation: /ˈθɪk(ə)nɪŋ/

noun

[mass noun]
  • 1the process or result of becoming broader, deeper, or denser: where two continents collide, some crustal thickening occurs [count noun]: one of the effects is a thickening of the skin
  • [count noun] a broader, deeper, or denser area of animal or plant tissue: trees with tiny thickenings on the winter twigs

adjective

  • becoming broader, deeper, or denser: a hazardous journey through thickening fog