coal obtained from under the sea, often used as a fuel

समुद्री कोयला

English Usage: In the past, sea coal was an important source of energy for coastal towns.

Hindi Usage: पुरानी बात है, समुद्री कोयला तटीय नगरों के लिए ऊर्जा का महत्वपूर्ण स्रोत था।