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

  • noun The body opening through which an animal takes in food.
  • noun The cavity lying at the upper end of the digestive tract, bounded on the outside by the lips and inside by the oropharynx and containing in humans and certain other vertebrates the tongue, gums, and teeth.
  • noun This cavity regarded as the source of sounds and speech.
  • noun The opening to any cavity or canal in an organ or a bodily part.
  • noun The part of the lips visible on the human face.
  • noun A pout, grimace, or similar expression.
  • noun A person viewed as a consumer of food.
  • noun A spokesperson; a mouthpiece.
  • noun Utterance; voice.
  • noun A tendency to talk excessively or unwisely.
  • noun Impudent or vulgar talk.
  • noun An opening, especially:
  • noun The part of a stream or river that empties into a larger body of water.
  • noun The entrance to a harbor, canyon, valley, or cave.
  • noun The opening through which a container is filled or emptied.
  • noun The muzzle of a gun.
  • noun The opening between the jaws of a vise or other holding or gripping tool.
  • noun An opening in the pipe of an organ.
  • noun The opening in the mouthpiece of a flute across which the player blows.
  • intransitive verb To speak or pronounce, especially.
  • intransitive verb To declare in a pompous manner; declaim.
  • intransitive verb To utter without conviction or understanding.
  • intransitive verb To form soundlessly.
  • intransitive verb To take in or touch with the mouth.
  • intransitive verb To orate affectedly; declaim.
  • intransitive verb To grimace.
  • idiom (down in/at) Discouraged; sad; dejected.

from The Century Dictionary.

  • To utter.
  • To utter with a voice affectedly big or swelling, or with more regard to sound than to sense.
  • To touch, press, or seize with the mouth or lips; take into the mouth; mumble; lick.
  • To reproach; insult.
  • To speak with a full, round, or loud voice; speak affectedly; vociferate; rant: as, a mouthing actor.
  • To join mouths; kiss.
  • To make a mouth; make a wry face; grimace.
  • noun In transverse flutes, the edge of a mouth-hole. See mouth-hole.
  • noun In metallurgy, the opening through which a furnace is charged with fuel, ore, etc.
  • noun In mining, a mine entrance.
  • noun The oral opening or ingestive aperture of an animal, of whatever character and wherever situated; the os, or oral end of the alimentary canal or digestive system.
  • noun Specifically — The human mouth regarded as the channel of vocal utterance.
  • noun The interior hollow of the mouth; the buccal cavity: as, inflammation of the mouth and throat.
  • noun The exterior opening or orifice of the mouth; the lips: as, a well-formed mouth; a kiss on the mouth.
  • noun In entomology, the mouth-parts collectively; the oral organs or appendages which are visible externally: as, the trophi of a mandibulate mouth.
  • noun Anything resembling a mouth in some respect.
  • noun The part of a river or other stream where its waters are discharged into the ocean or any large body of water; a conformation of land resembling a river-mouth.


from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English, from Old English mūth; see men- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English mouth, from Old English mūþ ("mouth, opening, door, gate"), from Proto-Germanic *munþaz (“mouth”), from Proto-Indo-European *ment- (“to chew; jaw, mouth”). Cognate with Scots mouth ("mouth"), North Frisian müd, müth, müss ("mouth"), West Frisian mûn ("mouth"), Dutch mond ("mouth"), muide ("river mouth") and mui ("riptide"), German Mund ("mouth"), Swedish mun ("mouth"), Faroese muður, munnur ("mouth"), Icelandic munnur ("mouth"), Gothic 𐌼𐌿𐌽𐌸𐍃 (munþs, "mouth"), Latin mentum ("chin") and mandō ("to chew"), Ancient Greek μάσταξ (mástax, "jaws, mouth") and μασάομαι (masáomai, "to chew"), Albanian mjekër ("chin, beard"), Welsh mant ("jawbone"), Hittite mēni ("chin").


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