2. (adj)revealing, telling, telltale(a) disclosing unintentionally "a telling smile"; "a telltale panel of lights"; "a telltale patch of oil on the water marked where the boat went down"
2. (noun)telltale one who officiously communicates information of the private concerns of others; one who tells that which prudence should suppress
3. (noun)telltale a movable piece of ivory, lead, or other material, connected with the bellows of an organ, that gives notice, by its position, when the wind is exhausted
4. (noun)telltale a mechanical attachment to the steering wheel, which, in the absence of a tiller, shows the position of the helm
5. (noun)telltale a compass in the cabin of a vessel, usually placed where the captain can see it at all hours, and thus inform himself of the vessel's course
6. (noun)telltale a machine or contrivance for indicating or recording something, particularly for keeping a check upon employees, as factory hands, watchmen, drivers, check takers, and the like, by revealing to their employers what they have done or omitted