c : the opening of a container b : the surface opening of an underground cavity b : the surface opening of an underground cavity b : the surface opening of an underground cavity http://www.merriam-webster.com/dictionary/mouth c : the opening of a container c : the opening of a container b : the surface opening of an underground cavity c : the opening of a container b : the surface opening of an underground cavity b : the surface opening of an underground cavity c : the opening of a container b : the surface opening of an underground cavity b : the surface opening of an underground cavity MOUTH (noun) Merriam-Webster b : the surface opening of an underground cavity c : the opening of a container c : the opening of a container b : the surface opening of an underground cavity c : the opening of a container MOUTH c : the opening of a container c : the opening of a container M-W b : the surface opening of an underground cavity mouth c : the opening of a container b : the surface opening of an underground cavity b : the surface opening of an underground cavity c : the opening of a container b : the surface opening of an underground cavity c : the opening of a container MOUTH b : the surface opening of an underground cavity b : the surface opening of an underground cavity MOUTH c : the opening of a container c : the opening of a container MOUTH mouth c : the opening of a container mouth c : the opening of a container MOUTH b : the surface opening of an underground cavity c : the opening of a container b : the surface opening of an underground cavity b : the surface opening of an underground cavity mouth c : the opening of a container http://www.merriam-webster.com/dictionary/mouth b : the surface opening of an underground cavity c : the opening of a container MOUTH (noun)