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stemmer 音標拼音: [st'ɛmɚ] 除梗機; 導火線; 炮棍 除梗機; 導火線; 炮棍 stemmer n 1: a worker who strips the stems from moistened tobacco leaves and binds the leaves together into books [synonym: {stripper}, {stemmer}, {sprigger}] 2: a worker who makes or applies stems for artificial flowers 3: an algorithm for removing inflectional and derivational endings in order to reduce word forms to a common stem [synonym: {stemmer}, {stemming algorithm}] 4: a miner's tamping bar for ramming packing in over a blasting charge 5: a device for removing stems from fruit (as from grapes or apples) Stemmer \Stem"mer\, n. One who, or that which, stems (in any of the senses of the verbs). [1913 Webster] 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). (1997-04-09)
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