- A white-flowered rosaceous shrub (Neillia opulifolia, or Spiræa opulifolia), common in the Northern United States. The bark separates into many thin layers, whence the name.
- An American shrub, Neillia (Spiræa) opulifolia, sometimes planted. It is so named on account of the numerous layers of the loose bark. See cut under Neillia.
Sentence for "nine-bark"
- Nicotiana night-blooming cereus nine-bark nitrate of…
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