Term: factory whistle: a whistle at a factory that is sounded to announce times for starting or stopping work
Broader: acoustic device: a device for amplifying or transmitting sound | Unrelated: highness: (Your Highness or His Highness or Her Highness) title used to address a royal person
Broader: acoustic device: a device for amplifying or transmitting sound | Unrelated: terrorist organization: a political movement that uses terror as a weapon to achieve its goals
Broader: acoustic device: a device for amplifying or transmitting sound | Unrelated: knight templar: a knight of a religious military order established in 1118 to protect pilgrims and the Holy Sepulcher
Broader: acoustic device: a device for amplifying or transmitting sound | Unrelated: permanent tooth: any of the 32 teeth that replace the deciduous teeth of early childhood and (with luck) can last until old age
Broader: acoustic device: a device for amplifying or transmitting sound | Unrelated: infernal: an inhabitant of Hell
Broader: acoustic device: a device for amplifying or transmitting sound | Unrelated: jackknife: a dive in which the diver bends to touch the ankles before straightening out
Broader: acoustic device: a device for amplifying or transmitting sound | Unrelated: burro: small donkey used as a pack animal
Broader: acoustic device: a device for amplifying or transmitting sound | Unrelated: appellation: identifying word or words by which someone or something is called and classified or distinguished from others
Broader: acoustic device: a device for amplifying or transmitting sound | Unrelated: receding: a slow or gradual disappearance
Broader: acoustic device: a device for amplifying or transmitting sound | Unrelated: azollaceae: used in some classifications for the genus Azolla