(chemistry) A device that produces an electric current through simultaneous oxidation and reduction reactions occurring at two connected half cells.

Alternative spelling of photocell

(pathology, Britain) A severe hereditary form of anaemia, mainly affecting people of African origin, in which mutated haemoglobin distorts red blood cells into a crescent shape, causing the cells to become stuck in capillaries. Downstream tissues are thus deprived of oxygen causing ischaemia and infarction.

(hematology, cytology, immunology) A type of blood cell that is involved with an immune response, or part of the immune system.

(hematology, cytology) A type of cell in the blood of vertebrates that contains hemoglobin and transports oxygen from the lungs to the tissues; an erythrocyte.

(Britain) A disease characterized by sickle-shaped red blood cells.

A cell that forms four megaspores by meiosis; a megasporocyte.

(oncology) A giant lymphocyte characteristic of Hodgkin's lymphoma.

An electric battery employing a zinc-carbon dry cell.

(immunology) A cytotoxic T cell.