gist

n. essential part; main point

In computing, GiST or Generalized Search Tree, is a data structure and API that can be used to build a variety of disk-based search trees. GiST is a generalization of the B+ tree, providing a concurrent and recoverable height-balanced search tree infrastructure without making any assumptions about the type of data being stored, or the queries being serviced. GiST can be used to easily implement a range of well-known indexes, including  B+ trees, R-trees, hB-trees, RD-trees, and many others; it also allows for easy development of specialized indexes for new data types. It can not be used directly to implement non-height-balanced trees such as quad trees or prefix trees (tries), though like prefix trees it does support compression, including lossy compression. GiST can be used for any data type that can be naturally ordered into a hierarchy of supersets. Not only is it extensible in terms of data type support and tree layout, it allows the extension writer to support any query predicates that they choose. The most widely-used GiST implementation is in the PostgreSQL relational database; it was also implemented in the Informix Universal Server, and as a standalone library, libgist.
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GIST may be:, the central idea or the essenceGwangju Institute of Science and Technology, an R&D university in Gwangju city, South KoreaGiST, or Generalized Search Tree, a flexible datastructure for building search treesGist (Computing), a scientific graphics library written in C programming languageGastrointestinal stromal tumor, an uncommon malignancy of the gastrointestinal tractGerman Institute of Science and Technology, in SingaporeGist (band), a punk revival bandGist (company), a company which is part of the The BOC GroupGist, the grounds for action in a suit
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n. yeast, barm, leavening agent (used in bread and beer)

v. guess, speculate

v. ferment

(n.)
The main point, as of a question; the point on which an action rests; the pith of a matter; as, the gist of a question.
  

(n.)
A resting place.
  

Gastrointestinal stromal tumor. A type of tumor that usually begins in cells in the wall of the gastrointestinal tract. It can be benign or malignant.