Definitions

1. noun

The front of a Roman warship or a platform at the bow of such a ship, from which a commander could direct operations, or a platform from which orators or public speakers addressed their audience.

“The rostra in ancient Rome were famous for the speeches given by famous orators.”

2. noun

A beak-like or tongue-like structure, especially in mollusks such as oysters or clams.

“The rostra of the oyster filtered the water as it fed.”

3. noun

A projecting ridge or edge, especially on a bone.

“The rostra of the skull protected the brain from injury.”