
A sentinel node is a specifically designated node used with linked lists and trees as a traversal path terminator. A sentinel node does not hold or reference any data managed by the data structure. Sentinels are used as an alternative over using null as the path terminator in order to get one or more of the following benefits: == Example == struct...
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http://en.wikipedia.org/wiki/Sentinel_node

the first lymph node to receive drainage from a tumor, identified by means of dyes or radioactive tracers; used to determine whether there is lymphatic metastasis in certain types of cancer. If this node is negative for malignancy, others “upstream” from it are usually also negative. signal node.
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http://www.encyclo.co.uk/local/21001

Type: Term Synonyms: sentinel lymph node
Found on
http://www.medilexicon.com/medicaldictionary.php?t=60666
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