What is the meaning of Pestilential?

Of or relating to pestilence or plague.

1. Producing, spreading, promoting or infected with pestilence; causing infection.

   Producing, spreading, promoting or infected with pestilence; causing infection.

   Spreading in the manner of pestilence.

   Caused by pestilence.

   During which pestilence spreads.

   Having a harmful moral effect (especially one that is believed to spread in the manner of pestilence).

   Causing irritation or annoyance.

   pestilent; pestilential

   Source: wiktionary.org