The story
From g(u)an(osine) + -ciclovir (“bicyclic heterocycle compound”).
Etymology from Wiktionary, CC BY-SA 4.0.
ganciclovir
Today it means: An antiviral medication C₉H₁₃N₅O₄ related to acyclovir and used especially to treat or prevent cytomegalovirus retinitis in immunocompromised individuals. Full definition →