drone

Definition (noun): stingless male bee in a colony of social bees (especially honeybees) whose sole function is to mate with the queen

Definition (noun): an unchanging intonation

Definition (noun): someone who takes more time than necessary; someone who lags behind

Definition (noun): an aircraft without a pilot that is operated by remote control

Definition (noun): a pipe of the bagpipe that is tuned to produce a single continuous tone

Definition (verb): make a monotonous low dull sound

Example: The harmonium was droning on

Definition (verb): talk in a monotonous voice