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say it: STEM-ur
stemmer is a noun meaning "a worker who strips the stems from moistened tobacco leaves and binds the leaves together into books". It is pronounced /ˈstɛmɚ/ — STEM-ur. It carries 5 recorded senses.
a worker who makes or applies stems for artificial flowers
an algorithm for removing inflectional and derivational endings in order to reduce word forms to a common stem
a miner's tamping bar for ramming packing in over a blasting charge
a device for removing stems from fruit (as from grapes or apples)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for stemmer come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.