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Answer for the clue "Genus of chiefly tropical American trees having fragrant wood and yielding gum elemi ", 7 letters:
protium

Word definitions for protium in dictionaries

Wikipedia Word definitions in Wikipedia
Protium may refer to: In physics and chemistry, protium refers to hydrogen-1 , the most common isotope of the element hydrogen, with one proton and no neutrons. It is the most stable isotopic form of hydrogen. At normal condition it exists about 99.985% ...

Wiktionary Word definitions in Wiktionary
n. 1 (context isotope English) The lightest and most common isotope of hydrogen, having a single proton and no neutron - (nuclide 1 1 H) 2 An atom of this isotope.