carcinoma vs adenocarcinoma - definitions

Definitions of carcinoma on the Web: 

• any malignant tumor derived from epithelial tissue; one of the four major types of cancer
  wordnetweb.princeton.edu/perl/webwn
• A carcinoma is any cancer that arises from epithelial cells. Carcinomas invade surrounding tissues and organs and may metastasize, or spread, to lymph nodes and other sites.
  en.wikipedia.org/wiki/Carcinoma
  pathology2.jhu.edu/PANCREAS/agloss.cfm
• A malignancy arising from a tissue that lines a body cavity. Skin, gut, breasts, prostate are epithelial lining cell cancers and constitute the most common form of cancers in the human body.
  www.sharedexperience.org/Glossary.lasso
  
• A subtype of cancer that develops from tissues covering or lining organs or glands of the body, such as skin, colon, lung, or breast. Most of the cancers are carcinomas. Some cancers that arise from connective tissues like bone are called sarcomas. ...
  medicineworld.org/cancer/descriptions.html
• A malignant tumor that begins in the lining layer (epithelial cells) of organs. At least 80% of all cancers are carcinomas.
  www.americanbrachytherapy.org/aboutBrachytherapy/glossary.cfm
• This term refers to cancer of cells that line various organs. This category is the largest and the most common type of cancer.
  www.oncothyreon.com/about/glossary.html 
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  Definitions of adenocarcinoma on the Web:
  
• malignant tumor originating in glandular epithelium
  wordnetweb.princeton.edu/perl/webwn
  
• Any of several forms of carcinoma that originate in glandular tissue
  en.wiktionary.org/wiki/adenocarcinoma
• The form of cancer that most people are talking about when they refer to "cancer of the pancreas." These tumors account for 75% of all pancreas cancers. Microscopically, adenocarcinomas form glands. These tumors can grow large enough to invade nerves which can cause back pain. ...
  pathology2.jhu.edu/PANCREAS/agloss.cfm
• Cancerous cell growth in a glandular or glandlike pattern. This cancer can occur in various organs and is the most common cancer of the pancreas (also referred to as adenocarcinoma of the pancreas).
  www.gemzar.com/pat/pat930_glossary.jsp