Noun
Any of a series of chemical compounds:
spinochrome A (2-acetyl-3,5,6,8-tetrahydroxy-1,4-naphthalenedione)
spinochrome B (2,3,5,7-tetrahydroxy-1,4-naphthalenedione)
spinochrome C (2-acetyl-3,5,6,7,8-pentahydroxy-1,4-naphthalenedione)
spinochrome D (2,3,5,6,8-Pentahydroxy-1,4-naphthalenedione)
spinochrome E (hexahydroxy-1,4-naphthalenedione)
Source: en.wiktionary.org