Blood that is needed for continued life; blood regarded as the seat of life.
That which is required for continued existence or function.
A large membrane-enclosed organelle found in eukaryotic cells which contains genetic material.
The central part of a syllable, most commonly a vowel.
The core, central part of something, around which other elements are assembled.
An initial part or version that will receive additions.
The massive, positively charged central part of an atom, made up of protons and neutrons.
A ganglion, cluster of many neuronal bodies where synapsing occurs.