Meaning of aptychus | Babel Free
Definitions
A hard calcareous plate forming part of the body of an ammonite.
Examples
“It wasn't until the 1970s that paleontologists had amassed enough evidence to be certain that aptychi were modified lower jaws.”
CEFR level
B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
This word is part of the CEFR B2 vocabulary — upper intermediate level.