Definitions

1. noun

a surface or expanse of water or other liquid

“The sailboat glided over the calm oer of the lake on a warm summer day.”

2. noun

a point or surface in space relative to which the position or orientation of something else is determined

“The aircraft’s navigation system used the oer of the planet to guide its descent.”

3. verb

to cover or be covered with something, such as water

“The boat oered with waves as it approached the rocky shore.”