arsonist

[ ahr-suh-nist ]

/ ˈɑr sə nɪst /

a person who commits arson.

RELATED WORDS

First recorded in 1860–65; arson + -ist

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

By contrast, the arsonist behind the Napa fire was given 27 years in prison last year.
Brunello’s King Lear: Gianfranco Soldera Reflects on the Attack on His Wine|Alice Feiring|December 8, 2013|DAILY BEAST
Local media had been reporting that the arsonist was using some kind of Molotov cocktail to smash through the car windows.
Los Angeles Serial-Arson Suspect Charged|Christine Pelisek|January 3, 2012|DAILY BEAST
But fire department officials are not saying what they suspect the arsonist is using to ignite the fires.
What’s Driving L.A. Serial Arsonist to Set Fires?|Christine Pelisek|January 2, 2012|DAILY BEAST
Even so, police and fire officials say they are not sure if they are dealing with one arsonist or many.
Los Angeles Fires: Officials Race to Identify the Arsonist|Christine Pelisek|December 31, 2011|DAILY BEAST

But fire-department officials are not saying what they suspect the arsonist is using to ignite the fires.
Los Angeles Fires: Officials Race to Identify the Arsonist|Christine Pelisek|December 31, 2011|DAILY BEAST

1864, from arson + -ist.