Janus

noun
Ja*nus \ ˈjā-nəs \
1508
  • a Roman god that is identified with doors, gates, and all beginnings and that is depicted with two opposite faces

Janus-faced

adjective
Ja*nus-faced \ ˈjā-nəs-ˌfāst \
1682
  • having two contrasting aspects; especially : duplicitous, two-faced

Janus green

noun
Janus green \
1898
  • a basic azine dye used especially as a vital biological stain (as for mitochondria)
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