Definition of oar

• 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.
• n - An oarsman; a rower; as, he is a good oar.
• n - An oarlike swimming organ of various invertebrates.
• v. t. & i. - To row.