oar

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A long, thin, usually wooden pole with a blade at one end, used to row or steer a boat.
• noun A person who rows a boat, especially in a race.
• intransitive verb To propel with or as if with oars or an oar.
• intransitive verb To traverse with or as if with oars or an oar.
• intransitive verb To move forward by or as if by rowing.

from The Century Dictionary.

• noun A long wooden implement used for propelling a boat, barge, or galley.
• noun In brewing, a blade or paddle with which the mash is stirred.
• noun In zoöl., an oar-like appendage of an animal used for swimming, as the leg or antenna of an insect or crustacean, one of the parapodia of annelids, etc.
• noun One who uses an oar; an oarsman; also, a waterman.
• noun An obsolete spelling of ore.
• To use an oar or oars; row.
• To propel by or as by rowing.
• To traverse by or as by means of oars.
• To move or use as an oar.

from the GNU version of the Collaborative International Dictionary of English.

• noun 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.
• noun An oarsman; a rower.
• noun (Zoöl.) An oarlike swimming organ of various invertebrates.
• noun [Prov. Eng.] the water rail.
• noun an oar having the blade so curved as to afford a better hold upon the water in rowing.
• noun to cease rowing, and lay the oars in the boat.
• noun See under Feather.
• noun to cease pulling, raising the oars out of water, but not boating them; to cease from work of any kind; to be idle; to rest.
• noun to put something round that part which rests in the rowlock, to prevent noise in rowing.
• noun to give aid or advice; -- commonly used of a person who obtrudes aid or counsel not invited.
• noun to place them in the rowlocks.
• noun To peak the oars, to lift them from the rowlocks and hold them perpendicularly, the handle resting on the bottom of the boat.
• noun to allow them to trail in the water alongside of the boat.
• noun to take them out of the rowlocks.
• verb To row.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• 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.
• verb To row; to propel with oars.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an implement used to propel or steer a boat