ScienceAugust 19, 2026
gracile
GRAS-uhl
Definition
Slender, thin, or lightly built in physical structure.
Etymology
Derived from the Latin 'gracilis', meaning slender or thin, the word entered English in the late 19th century, primarily used in biological and anatomical contexts to describe delicate or slim structures.
In the news
The article uses the term to describe the relatively slim build of young T. rex individuals and the distinct anatomy of Nanotyrannus compared to the massive, heavy frame of a mature T. rex.
For decades, paleontologists argued that a small tyrannosaur found in Montana’s Hell Creek Formation was merely a young T. rex. Then, within five weeks in late 2025, independent studies in Nature and Science showed its bones belonged to mature animals
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