from The Century Dictionary.
- Same as
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Zoöl.) Same as
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective zoology
from Wiktionary, Creative Commons Attribution/Share-Alike License
This is remarkable as a case of acquired and inherited characteristics finding very different expression in the two valves of a group belonging to a class typically equivalvular.
These various genera, though ostreiform in the adult, are equivalvular and of totally different form in the free young.