I. ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: rock (I) + shaft
: a shaft that oscillates on its journals instead of revolving and that usually carries levers or projecting pieces (as arms, wipers, or tumblers) to receive and communicate reciprocating motion
II. noun
Etymology: rock (IV) + shaft
: a shaft through which rock filling is introduced into a mine