a voltaic cell consisting of two metal electrodes connected by an electrolyte

a photoelectric cell that uses a strip of selenium as the electron source

A container containing an electrolyte and two electrodes; used to produce direct current electricity; one or more of them constitute a battery.

(cytology) A cell that is part of the germ line: a gametocyte, an ovum or a sperm cell.

(cytology) A cell in the brain, such as a neuron or a glial cell. / (colloquial) neuron / (humorous) -- taken as a unit of intelligence

(cytology) A cell of the nervous system which conducts nerve impulses; a neuron.

(hematology, cytology) Any of the cells normally found in blood, namely erythrocytes and leukocytes, sometimes including the platelets.

A group of people (sleepers) who inconspicuously remain dormant in a community until activated, by a prearranged signal, to perform acts of espionage, sabotage, and/or terrorism.

(cytology) The semipermeable membrane that surrounds the cytoplasm of a cell.

(energy) An electrochemical device in which the intrinsic chemical free energy of fuel and oxidant is catalytically converted to direct current energy.