fer-de-lance
US /ˌfɛr.dəˈlæns/
UK /ˌfɛr.dəˈlæns/
1.
a large, highly venomous pit viper (genus Bothrops) found in Central and South America, known for its aggressive nature and potent venom
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The hiker narrowly avoided stepping on a coiled fer-de-lance.
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The bite of a fer-de-lance can be fatal if not treated quickly.