ironwood

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ironwood:

see hornbeamhornbeam
or ironwood,
name in North America for two groups of trees of the family Betulaceae (birch family), native to the eastern half of the continent. Carpinus caroliniana, also called blue beech and water beech, has smooth gray bark.
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ironwood

[′ī·ərn ‚wu̇d]
(botany)
Any of a number of hardwood trees in the United States, including the American hornbeam, the buckwheat, and the eastern hophornbeam.

ironwood

1. any of various betulaceous trees, such as hornbeam, that have very hard wood
2. a Californian rosaceous tree, Lyonothamnus floribundus, with very hard wood
3. any of various other trees with hard wood, such as the mopani
References in periodicals archive ?
Ironwood Pharmaceuticals is commercializing linaclotide for adults with irritable bowel syndrome with constipation (IBS-C) or chronic idiopathic constipation (CIC), and lesinurad, which is approved to be taken with a xanthine oxidase inhibitor (XOI) for the treatment of hyperuricemia associated with uncontrolled gout.
Gary Nabhan discovered ironwood's role as a keystone species in the Sonoran Desert ecosystem.
Although it is not classified as endangered, desert ironwood is greatly threatened by human activities.