The adjective apian describes anything having to do with bees. Your coworker might describe your outfit as apian if you wear your black skirt with a yellow sweater and tights.
You could call your fancy new beehive "an apian mansion," or say that your dabbling in beekeeping is an apian hobby. Biologists might refer to apian behavior or apian characteristics when they're talking about bees. Apian comes from the Latin word apianus, from the root word apis, or "bee."