From Longman Dictionary of Contemporary Englisharmchairarm‧chair1 /ˈɑːmtʃeə, ˌɑːmˈtʃeə $ ˈɑːrmtʃer, ˌɑːrmˈtʃer/ ●●○ noun [countable] 
DHFa comfortable chair with sides that you can rest your arms on
DHFa comfortable chair with sides that you can rest your arms onExamples from the Corpus
armchair• I heave an armchair into the kitchen, lay out some light reading, and prepare a flask of coffee.• Antheil closed the door and sat in an armchair under the devil drawing.• He selected an armchair to the left side of the desk.• I found her in a large day-room where groups of elderly ladies sat in plastic-covered armchairs.• Virtual reality will turn the weekly supermarket shop into a pleasure to be enjoyed from the comfort of the armchair.• Yet it's James they have to thank every time they sink into their armchairs to listen to their favourite classics.• Apart from the couch, there was a wooden armchair and a small drop-leaf table.armchairarm‧chair2 /ˈɑːmtʃeə $ ˈɑːrmtʃer/ adjective → armchair traveller/fan etcExamples from the Corpus
armchair• It's very easy to be an armchair critic but much harder to come up with solutions that will work.• Like most armchair sportsmen, Terry is sure he understands the game better than the referees.• Armchair travellers can now visit the world's most exotic countries via the Internet. 