| micromicro- pref. Symbol  One-trillionth (10-12): micromicrogram. |
micromicro-,
prefix meaning "10-12" (μμ): micromicron.
micromicro-
word element designating 10−12 (one-million-millionth) part of the unit to which it is joined; now supplanted by the prefix pico-.
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