pack-year

短语

词形变化

pack-years 复数 abbreviation PY 复数 py 复数

别名

PY pack year

释义与例句

n.
  1. 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.

    医学

词源

Compound of pack + year.

来源：wiktionary