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Significats de have biconcave en anglès

Encara no tenim significats per a "have biconcave".
Ús de have biconcave en anglès
1
They had biconcave vertebræ, ambulatory limbs, and a well-developed pelvis and shoulder girdle.
The Gutenberg Webster's Unabridged Dictionary: Section T, U, V, ...
2
A more reptilian character in the Ichthyornis group is the fact that, unlike any modern bird, but like their reptile ancestors, they had biconcave vertebrae.
The Story of Evolution