Frena
[fri:nә]
Definition
(pl. ) of Frenum
Checker: Percy
Examples
- These cirripedes have no branchiae, the whole surface of the body and of the sack, together with the small frena, serving for respiration. Charles Darwin. On the Origin of Species by Means of Natural Selection.
- The ovigerous frena of certain cirripedes, which have ceased to give attachment to the ova and are feebly developed, are nascent branchiae. Charles Darwin. On the Origin of Species by Means of Natural Selection.
Checker: Percy