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word element [Gr.], dwarf; small size; also used in naming units of measurement (symbol n) to designate an amount one billionth (10−9) the size of the unit to which it is joined, e.g., nanocurie.
nano-, nan-, nanno-, nann- [Gr. nanos, nannos, dwarf]
1. In the International System of Units (SI), a prefix meaningone billionth (10−9).
2. Prefixes meaning dwarfism.