cold front

WordReference Random House Learner's Dictionary of American English © 2026

ˈcold ˌfront, n. [countable]

1. Meteorology the zone separating two air masses, in which the cooler mass replaces the warmer:
   a cold front pushing down from Canada.

WordReference Random House Unabridged Dictionary of American English © 2026

cold′ front′, 

1. Meteorology the zone separating two air masses, of which the cooler, denser mass is advancing and replacing the warmer.

• 1920–25

Collins Concise English Dictionary © HarperCollins Publishers::

cold front noun

1. the boundary line between a warm air mass and the cold air pushing it from beneath and behind as it moves

Compare warm front