noun
: a number which is determined from the moisture content of a forest, wind speed, and other factors that affect burning conditions and from which ease of ignition and behavior of a forest fire may be estimated
noun
: a number which is determined from the moisture content of a forest, wind speed, and other factors that affect burning conditions and from which ease of ignition and behavior of a forest fire may be estimated
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012