A finely-ground powder made by heating and pulverizing limestone and clay.

A nonreproductive cell; any cell that is not involved in the production of gametes.

(astronomy) A great circle on the celestial sphere, coincident with the plane of earth's equator.

(immunology) A subtype of T cell, capable of inducing death in infected somatic or tumor cells.

plural of celestial equator

A species of juniper, Juniperus virginiana, of eastern North America.

(anatomy) A type of cell, in the nervous system, that provides support for the neurons.

plural of cell-phone

(immunology) Any cell that expresses cell surface receptors that deliver signals to either activate or inhibit a response as part of the innate immune system.

(sports) In which professionals and celebrities participate together