Princeton's WordNet

1. oar(noun)

   an implement used to propel or steer a boat

Kernerman English Learner's Dictionary

1. oar(noun)ˈɔr

   one of two long sticks used to move a rowboat

Wiktionary

1. oar(Noun)

   An implement used to propel a boat or a ship in the water, having a flat blade at one end, being rowed from the other end and being normally fastened to the vessel.

2. oar(Verb)

   To row; to propel with oars.

Origin: ar, from ár.

Webster Dictionary

1. Oar(u)

   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. Oar(u)

   an oarsman; a rower; as, he is a good oar

3. Oar(u)

   an oarlike swimming organ of various invertebrates

4. Oar(u)

   to row

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