English Explanatory Dictionary

pack-year

English dictionary entry

Meanings

noun
  1. A unit of measure for estimating the number of cigarettes a person has previously smoked, equivalent to average number of packs (each containing 20 cigarettes) smoked per day multiplied by the number of years the person has smoked.

Word forms

pack-year pack-years PY pack year

Etymology

Compound of pack + year.

Related words

ever-smoker never-smoker
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