Ma'anar ƙamus na bam ɗin thermonuclear, wanda kuma aka sani da bam ɗin hydrogen ko H-bomb, nau'in makamin nukiliya ne wanda ke samun ikon lalatarsa daga halayen haɗin gwiwar nukiliya. Ba kamar bama-bamai na atomic, waɗanda suka dogara da fission na nukiliya, bama-bamai na thermonuclear suna amfani da halayen fission da haɗin kai don haifar da fashewa. Wadannan bama-bamai sun hada da hadewar kwayoyin atomic don samar da wani abu mai kuzari sosai wanda ke sakin zafi mai yawa da radiation, wanda ke haifar da mummunar lalacewa. Ana la'akari da su a matsayin mafi girman makamai da aka taɓa ƙirƙira.