eta meaning, definition, what is eta: the seventh letter of the Greek alphabet. Learn more.
shafts definition, shafts meaning | English dictionary. shaft. 1 the long narrow pole that forms the body of a spear, arrow, etc. 4 a rod or pole forming the handle of a hammer, axe, golf club, etc.
Definition of arbor. 1  1 : a spindle or axle of a wheel. 2  2 : a main shaft or beam. 3  3 : a shaft on which a revolving cutting tool is mounted. 4  4 : a spindle on a cutting machine that holds the work to be cut.