Each of two or more different physical forms in which an element can exist. Graphite, charcoal, and diamond are all allotropes of carbon.
- Two allotropes of the element exist, accounting for the slight variation in densities.
- Each of these allotropes of phosphorous also has its own subset of forms.
- A third allotrope occurs as an amorphous brown powder with a density of 2.350 grams per cubic centimeter.
Late 19th century: back-formation from allotropy.
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Line breaks: allo|trope
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