boy

noun

• 1a male child or young man:a group of six boys
• a son:she put her little boy to bed
• [with modifier] a male child or young man who does a specified job:a delivery boy

• 2 [usually with adjective] used informally or lightheartedly to refer to a man:the inspector was a local boy
• dated used as a friendly form of address from one man to another, often from an older man to a young man:my dear boy, don’t say another word!
• dated offensive (often used as a form of address) a black male servant or worker.
• used as a form of address to a male dog:down boy, down!

exclamation

• used to express strong feelings, especially of excitement or admiration:oh boy, that’s wonderful!