yell

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

• intransitive verb To cry out loudly, as in pain, fright, surprise, or enthusiasm.
• intransitive verb To utter or express with a loud cry.
• noun A loud cry; a shout.
• noun A cheer uttered or chanted in unison.

from The Century Dictionary.

• To cry out with a sharp, loud noise; shriek; cry or scream as with agony, horror, or ferocity.
• To utter with a yell.
• Dialectal forms of ale, ale-house.
• noun A sharp, loud outcry; a scream or cry suggestive of horror, distress, agony, or ferocity.
• noun Specifically
• noun A call or cry peculiar to a special body of persons: as, a class yell; the yell of Columbia, 91.
• Same as yeld.

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

• intransitive verb To cry out, or shriek, with a hideous noise; to cry or scream as with agony or horror.
• transitive verb To utter or declare with a yell; to proclaim in a loud tone.
• noun A sharp, loud, hideous outcry.

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

• adjective Ulster dry (of cow)
• verb intransitive shout; holler; make a loud sound with the voice.
• verb transitive To convey by shouting.
• noun A shout.

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

• verb utter a sudden loud cry
• noun a loud utterance; often in protest or opposition
• verb utter or declare in a very loud voice
• noun a loud utterance of emotion (especially when inarticulate)