The spelling of the word "tactor" seems peculiar, but it's derived from the word "tactile" which means touch. In IPA phonetic transcription, "tactor" is pronounced as /ˈtæktər/, with a soft "a" sound, followed by a hard "t" sound and the schwa sound in the middle. The spelling may be confusing, but it's commonly used in the field of technology to refer to a device that uses physical vibrations to stimulate touch sensations in humans, such as haptic or vibration motors.
A tactile end-organ.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.