‘毒蛇’ literally combines two characters: 毒 (dú), meaning ‘poison’ or ‘venom’, and 蛇 (shé), meaning ‘snake’. Together, they form a compound noun meaning ‘venomous snake’—a snake capable of injecting venom through fangs, often posing danger to humans and animals. Unlike the general term 蛇 (shé), which refers to all snakes (including non-venomous ones), 毒蛇 specifically denotes species with medically significant venom, such as cobras, vipers, or kraits.

This word is commonly used in nature writing, safety warnings, medical contexts, and wildlife education. It carries a neutral-to-negative connotation depending on context—it’s factual in scientific descriptions but often implies threat or caution in everyday speech. While not inherently formal, it appears more frequently in written or semi-formal registers than in casual conversation, where speakers might say ‘有毒的蛇’ for clarity or emphasis.