染 - dye, color, paint

contagious disease; communicable disease; transmissible disease; infectious disease; epidemic

pollution; contamination

infectious disease; infection

to become familiar with; to get used to; to become accustomed to; to adapt oneself to; to become attached to; to become friendly with

infection; contagion; becoming infected

contagion; infection

familiar; well-known; regular (e.g. customer); favourite; favorite

COVID-19; coronavirus disease 2019

dyeing; printing

chromosome

stain; spot; smudge; blot; smear; blotch

to pierce; to penetrate; to soak in; to permeate