turnsole /tûrnˈsōl/

1. A plant whose flowers are supposed to face the sun, as heliotrope or the euphorbiaceous Chrozophora tinctoria
2. A deep-purple dye obtained from the latter
3. Litmus

• air-conditioners
• air-conditioning
• air-conditions
• air-cool
• air-cooled
• air-cooling
• air-cools
• air-corridor
• air-corridors
• air-cover
• air-covers
• aircraft
• aircraft-carrier
• aircraft-carriers
• aircraftman
• aircraftmen
• aircraftsman
• aircraftsmen
• aircraftswoman
• aircraftswomen
• aircraftwoman
• aircraftwomen
• aircrew
• aircrews
• air curtain