|n.||1.||One who, or that which, stems (in any of the senses of the verbs).|
|Noun||1.||stemmer - a worker who strips the stems from moistened tobacco leaves and binds the leaves together into books|
|2.||stemmer - a worker who makes or applies stems for artificial flowers|
|3.||stemmer - an algorithm for removing inflectional and derivational endings in order to reduce word forms to a common stem|
Synonyms: stemming algorithm
|4.||stemmer - a miner's tamping bar for ramming packing in over a blasting charge|
|5.||stemmer - a device for removing stems from fruit (as from grapes or apples)|
|(information science, human language)||stemmer - A program or algorithm
which determines the morphological root of a given inflected
(or, sometimes, derived) word form -- generally a written word
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).