corollary: [14] Latin corolla was a ‘little crown or garland’, typically made from flowers (the word was a diminutive form of corōna ‘crown’, source of English crown). Hence a corollārium was ‘money paid for such a garland’, and by extension ‘gratuity’. Later it developed the meaning ‘deduction’, applied in geometry to a subsidiary proposition dependent on a previous proof, the sense in which it was first borrowed into English. (English acquired corolla itself in the 17th century.) => coronary, crown[corollary etymology, corollary origin, 英语词源]