
1) Metric weight unit 2) One billionth gram 3) One-trillionth of a kilo 4) Weight unit
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https://www.crosswordclues.com/clue/nanogram

1) Ng
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https://www.crosswordclues.com/clue/nanogram

A measure of weight. One nanogram weighs a billion times less than one gram, and almost a trillion-times less than a pound.
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http://www.cancer.gov/dictionary?expand=N

One-billionth of a gram (10-9 g). ... Abbreviation: ng ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

(nan´o-gram) one billionth (10−9) of a gram.
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http://www.encyclo.co.uk/local/21001
(ng) Type: Term Pronunciation: nan′ō-gram Definitions: 1. One billionth of a gram (10−9 g).
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http://www.medilexicon.com/medicaldictionary.php?t=58764

One billionth of a gram.
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http://www.thehorse.com/Glossary.xhtml?L=N

nanogram 1. One-billionth of a gram (10-9 g). 2. One billionth (1/1,000,000,000) gram: NG.
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http://www.wordinfo.info/words/index/info/view_unit/1365/2
ng noun one billionth (1/1,000,000,000) gram
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https://www.encyclo.co.uk/local/20974

(ng) A nanogram is one one-billionth (1/1,000,000,000) of a gram. It is 1,000 times smaller than a microgram.
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https://www.health.ny.gov/environmental/glossary/

one billionth of a gram. Abbr.: ng
Found on
https://www.infoplease.com/dictionary/nanogram
No exact match found.