Cell

Etymology

From Latin "cella" (a small room or storeroom). Robert Hooke coined the biological sense in 1665 when the compartments he saw in cork under a microscope reminded him of the bare cells monks lived in.

noun · /SELL/
The smallest unit of life that can function on its own — the basic building block of every living thing.
What it names
The boundary where life begins: below it are mere molecules, at it you have something that eats, grows, and reproduces.
Example
The human body is built from tens of trillions of cells, each a self-contained factory running on its own.
Related idea
A cell is the smallest living unit; an organism may be a single cell or trillions working together. A bacterium is one cell that is also a whole organism, while you are an organism made of many.
noun · /SELL/
A small, semi-autonomous group operating as one unit of a larger secret or revolutionary organization.
What it names
It borrows biology's smallest living unit for clandestine structure, where each group knows little of the others so the whole survives if one is caught.
Example
The network was organized into isolated cells that never communicated directly.
Related idea
Unlike an open faction, a cell is deliberately walled off: each group knows little of the others, so the wider network survives even when one is exposed.
noun · /SELL/
A small, bare room, especially one where a prisoner is locked or a monk or nun lives.
What it names
A tiny enclosed space for a single occupant — the original meaning from which the biological cell borrowed its name.
Example
The monk’s cell held only a bed, a desk, and a candle.
Related idea
An atrium is a large, open central space; a cell is its opposite — small, closed, and solitary. Robert Hooke named biology’s cell after these compartments because they reminded him of monks’ rooms.