Heilong is a Chinese word that means black dragon, a powerful and mystical creature prominent in Chinese mythology. Several synonyms for this word include "dark dragon," "shadow dragon," and "midnight dragon." Other similar terms for heilong are "obsidian serpent," "coal drake," "jet wyrm," and "inky serpent." These synonyms are commonly used in literature, films, and video games for naming powerful dragons that evoke a sense of mystery and danger. In some contexts, the term "black serpent" or "ebony dragon" may also be used as synonyms for heilong. Regardless of the synonym used, all these terms signify the indomitable power and imposing presence of the mythical creature known as the black dragon.