valonia
/vəˈloʊniə/
noun
- The acorn cups of certain oak trees, used in tanning and dyeing.
- Harvesters collected valonia from the oak forests in autumn.
- Valonia gives a rich brown color to wool when used as a natural dye.
- The tannery imported valonia from the Mediterranean to treat leather.
- A type of large green algae found in warm seas, also called sailor's eyeball.
- The aquarium had to remove valonia because it was taking over the tank.
- Valonia algae can grow as big as a tennis ball in tropical waters.
- While snorkeling, we saw a strange green ball that turned out to be valonia.