Any of several shrubby plants of arid regions with waxy or resinous wood, especially creosote bush.
From 'grease' + 'wood'; the name refers to the oily or resinous texture of the plant's wood and leaves, which is characteristic of desert shrubs adapted to dry climates.
Greasewood was crucial to early desert settlers because its wood, though not great for building, burned hot and long for fuel and cooking, and the entire plant could be used for various purposes—it's the kind of humble plant that kept people alive in harsh environments.
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