Sang-froid n. : Freedom from agitation or excitement of mind; coolness in trying circumstances; indifference; calmness.

Example:
If a frenchman tells you to keep your 'Sang-froid' (cold blood), what does he mean?

Taxonomy
sangfroid, Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, glossary, english, language, ESL, säⁿ, wä, Etymology, sang-froid, cold blood, self-possession, imperturbability.

Defination from the web:
... Etymology: French sang-froid, literally, cold blood. Date: 1750 : self-possession or imperturbability especially under strain. synonyms see equanimity ...