An organism that lives within the body of another organism, deriving nutrients at the host's expense.

आंतरिक परजीवी

English Usage: The internal parasite caused significant health issues for the host animal.

Hindi Usage: आंतरिक परजीवी ने पालतू जानवर के लिए महत्वपूर्ण स्वास्थ्य समस्याएँ पैदा कीं।