ser·tum
ˈsərtəm
plural serta
-tə
: a scientific treatise upon a collection of plants
plural sertums also sertum or sertrum
: a coin of Bhutan first issued in the second half of the 20th century
Note: Most sources use sertums as a general plural, but coins show sertum for the denomination two and sertrum for five.
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Merriam-Webster unabridged
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