Wiktionary
butter chicken
n. A mild curry with marinaded chicken in a makhani sauce.
Wikipedia
Butter chicken
Butter chicken or murgh makhani ( Hindi: मुर्ग़ मक्खनी) is an Indian dish of chicken in a mildly spiced curry sauce. It is served in India and abroad. The dish has its roots in Punjabi cuisine and was developed by the Moti Mahal restaurant in Delhi, India.