1. (n) An implement for impelling a boat, being a slender piece of timber, usually ash or spruce, with a grip or handle at one end and a broad blade at the other. The part which rests in the rowlock is called the loom.

2. (n) An oarsman; a rower; as, he is a good oar.

3. (n) An oarlike swimming organ of various invertebrates.

4. (v. t. & i.) To row.