IPA: /ˈvɪrələnt/
KK: /ˈvɪrələnt/
Extremely harmful or dangerous, especially in a way that can cause serious illness or injury. It can also refer to something that is very hostile or aggressive.
The virulent strain of the virus spread quickly through the population.
Virulent is formed from "virus" (from Latin, meaning poison or venom) and the suffix "-lent" (meaning full of). The word describes something that is full of poison or highly infectious.
Think of 'virus' meaning poison, and remember that 'virulent' describes something that is full of poison or very harmful.