The sub-discipline of soil science that: studies soils as a component of natural systems or deals with soil genesis and soil classification or studies the soil profile or solum in its natural setting.

To disengage the clutch on a vehicle or other engine with PTO

(inorganic chemistry) The sulfide of mercury, HgS, that occurs as the mineral cinnabar.

(obsolete, intransitive) To talk; to converse; to parley.