pack-year

名词 n.
中文释义

英文释义

名词 n.
  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.

词形变化

pack-years plural PY abbreviation py abbreviation pack year alternative

词源

Compound of pack + year.
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