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[stem-er] /ˈstɛm ər/
a person who removes stems.
a device for removing stems, as from tobacco, grapes, etc.
Origin of stemmer1
1890-95; stem1 + -er1


[stem-er] /ˈstɛm ər/
an implement for stemming or tamping.
1855-60; stem2 + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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stemmer in Technology

information science, human language
A program or algorithm which determines the morphological root of a given inflected (or, sometimes, derived) word form -- generally a written word form.
A stemmer for English, for example, should identify the string "cats" (and possibly "catlike", "catty" etc.) as based on the root "cat", and "stemmer", "stemming", "stemmed" as based on "stem".
English stemmers are fairly trivial (with only occasional problems, such as "dries" being the third-person singular present form of the verb "dry", "axes" being the plural of "ax" as well as "axis"); but stemmers become harder to design as the morphology, orthography, and character encoding of the target language becomes more complex. For example, an Italian stemmer is more complex than an English one (because of more possible verb inflections), a Russian one is more complex (more possible noun declensions), a Hebrew one is even more complex (a hairy writing system), and so on.
Stemmers are common elements in query systems, since a user who runs a query on "daffodils" probably cares about documents that contain the word "daffodil" (without the s).
(This dictionary has a rudimentary stemmer which currently (April 1997) handles only conversion of plurals to singulars).

The Free On-line Dictionary of Computing, © Denis Howe 2010
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