Sentence:  It's [the mouth's] hooked Form is of great Uſe to the rapacious Kind [of bird], in catching and holding their Prey, and in the <WSD>Comminution</WSD> thereof by tearing; to others it is no less ſerviceable to their climbing, as well as neat and nice <WSD>Comminution</WSD> of their Food. 
Meaning of the word marked with <WSD> tags:  The breaking or grinding up of a material to form smaller particles.