A microscopic or very small animal, often used in historical contexts referring to tiny organisms.

सूक्ष्म जीव

English Usage: The scientist studied the animalculum under the microscope to understand its behavior.

Hindi Usage: वैज्ञानिक ने सूक्ष्म जीव का अध्ययन किया ताकि उसकी व्यवहार को समझ सके।