📒 an aircraft without a pilot, or a small flying device, controlled from the ground and used for taking photographs, dropping bombs, delivering goods, etc.
📒 a continuous low noise
📒 a continuous low sound made by some musical instruments, for example the bagpipes, over which other notes are played or sung; the part of the instrument that makes this noise
📒 a male bee that does not work
📒 a person who is lazy and gives nothing to society while others work