neem /niːm/ noun1 •Azadirachta indica, a large, mostly evergreen tree from India, whose seeds yield neem oil, the insecticide azadirachtin.He was standing at the gate, rubbing his teeth with a twig broken from a neem tree – which is what many poor people in my country do, Mr Premier, when they want to clean their teeth. — 2008 formsneems