the application of logic and clear thinking to do something.
Mental or intellectual labor.
In architecture, the heads and other ornaments on the keystone of an arch.
plural The selection of synthetic works or constructions at the head of an artificial channel or channel essential to divert and regulate the movement of water from a river or any other body of liquid in to the channel.
plural A platform or raft with windlass or capstan which is attached to the front side of a log-raft or growth of logs for warping, kedging. or winding it through lakes and still water, yourself or horse-power.