A device resembling a piece (or several pieces) of fire-wood, used in a fireplace in which gas is burned.(noun)
The Century Dictionary (Public Domain)
Use "gas-log" in a sentence
"Features: Sound-proof media room, infinity pool and pool house, library, wine cellar with custom inventory system, three gas-log fireplaces, smart house technology, historic refurbished caboose on property, three-car garage."
"At stage right is a fireplace with a gas-log fire."
"Notable: There are five guest rooms, all with private baths, king-sized beds and gas-log fireplaces."