pyro-

from the GNU version of the Collaborative International Dictionary of English.

• Combining forms designating fire or heat; specifically (Chem.), used to imply an actual or theoretical derivative by the action of heat; as in pyrophosphoric, pyrosulphuric, pyrotartaric, pyrotungstic, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• prefix fire, heat.
• prefix fever.
• prefix chemistry orthoacid.