from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. 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.
Sorry, no etymologies found.