noun
: an arrangement consisting of a gear wheel made integral with a hollow spindle or shaft ; especially : a hollow shaft with a gear wheel on each end used in the back gear of a lathe or other machine tool
noun
: an arrangement consisting of a gear wheel made integral with a hollow spindle or shaft ; especially : a hollow shaft with a gear wheel on each end used in the back gear of a lathe or other machine tool
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012