"Truncatus" is a Latin word meaning "truncated" or "cut off".
It is often used in biology and zoology to describe a part of an organism that is shortened or abruptly ended.
Examples
Truncated cone: A cone cut off at its top.
Truncated leaf: A leaf with a blunt or flattened tip.
Truncated tooth: A tooth that is shortened or has a blunt tip.
The term is frequently used as a specific epithet in scientific names to indicate a distinctive characteristic of the organism.