main line

noun

Definition of main line

  1. 1 :  a principal highway or railroad line

  2. 2 slang :  a principal vein of the circulatory system

1841

First Known Use of main line

1841


MAIN LINE Defined for English Language Learners

main line

noun

Definition of main line for English Language Learners

  • : an important highway or railroad line


Medical Dictionary

main line

noun

Medical Definition of main line

  1. slang :  a principal vein of the circulatory system

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