Viper (noun)

A venomous snake of a family that includes the adders and pit vipers, characterized by a pair of long, hollow, venom-injecting fangs in the upper jaw.

Origin:

Middle english: from old french vipere, from latin vipera, from vivus "alive" + parare "to make ready" (because of the snake"s lively movements).

Examples:

1. A viper bit him and he died.
2. The viper's venom can be fatal if not treated quickly.
3. The viper's venom causes severe pain and swelling.
4. The viper slithered away into the underbrush.
5. The viper had a distinctive zigzag pattern on its back.