
1) Genus protium 2) Isotope of hydrogen 3) Rosid dicot genus
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1) Hydrogen
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https://www.crosswordclues.com/clue/protium
[plant] Protium is a genus of more than 140 species of flowering plants in the family Burseraceae. It is native to the Neotropics (where more than 100 species occur), Madagascar, New Guinea, and southern Asia from Pakistan east to Vietnam. The genus was for some time included in Bursera, but is well distinct, being most closely related to C...
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http://en.wikipedia.org/wiki/Protium_(plant)

(from the article `Sapindales`) ...of northeastern Africa, Madagascar, and from Arabia to India. Three genera with about 100 species each are: Bursera, occurring in tropical America ... ...to India with other species that produce resins, also used in incense and perfumes. Resin collecting is an important part of the economy in ... [2...
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http://www.britannica.com/eb/a-z/p/123

isotope of hydrogen (q.v.) with atomic weight of approximately 1; its nucleus consists of only one proton. Ordinary hydrogen is made up almost ... [1 related articles]
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Synonym for hydrogen-1 ... The common hydrogen-1 isotope, making up 99.985% of the hydrogen-1 atoms occurring in nature. ... Synonym: protium. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

(pro´te-әm) the mass 1 isotope of hydrogen, symbol 1H; ordinary, or light, hydrogen.
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http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: prō′tē-ŭm Synonyms: hydrogen-1
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http://www.medilexicon.com/medicaldictionary.php?t=73112

Protium is an isotope of hydrogen.
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http://www.probertencyclopaedia.com/browse/GP.HTM

[
n] - genus of chiefly tropical American trees having fragrant wood and yielding gum elemi
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http://www.webdictionary.co.uk/definition.php?query=Protium

The lightest element of hydrogen of unit mass and the most prevalent in the universe.
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https://www.encyclo.co.uk/local/20687
genus Protium noun genus of chiefly tropical American trees having fragrant wood and yielding gum elemi
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https://www.encyclo.co.uk/local/20974

the lightest and most common isotope of hydrogen. Symbol: H
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https://www.infoplease.com/dictionary/protium
No exact match found.