A ridge or projection often associated with a part of a biological structure, such as in animals.

जीववैज्ञानिक संरचना का एक उभार

English Usage: The bird's foot had a distinct calcar that helped it perch better.

Hindi Usage: पक्षी के पैर में एक स्पष्ट कल्कार था जिसने इसे ठीक से बैठने में मदद की।