midnight sun

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

ˈmid•night ˈsun, n. [uncountable* the + ~]

1. the sun that is visible at midnight during the summer in the arctic and antarctic.

WordReference Random House Unabridged Dictionary of American English © 2026

mid′night sun′, 

1. the sun visible at midnight in mid-summer in arctic and antarctic regions.

• 1855–60

Collins Concise English Dictionary © HarperCollins Publishers::

midnight sun noun

1. the sun visible at midnight during local summer inside the Arctic and Antarctic circles