(idiomatic) Two things which are incapable of mixing or coexisting harmoniously with each other.

olive oil prepared in Florence, Italy

A traditional Ayurvedic folk remedy where vegetable oil is swished or held in the mouth, thereby supposedly "pulling out" toxins.

petroleum

The heavy oil obtained in the distillation of coal tar, containing phenol, naphthalus, etc.

(petrochemistry) The oily product, lighter than water, forming the chief part of the first distillate of coal tar, and consisting largely of benzene and toluene.

A paraffin oil used as an illuminant and lubricant.

An anthelmintic consisting of oil obtained from the seeds of Dysphania anthelmintica (syn. Chenopodium anthelminticum.

A test for determining the temperature at which petroleum oils give off vapor which is liable to explode.

An empyreumatic oil obtained by subjecting a brick soaked in oil to distillation at a high temperature; formerly used in medicine and by lapidaries.