out-of-door(s)

WordReference Random House Learner's Dictionary of American English © 2025

out-of-doors /ˈaʊtəvˈdɔrz/   adj. 

1. Also, ˈout-of-ˈdoor. outdoor:
   out-of-doors activities.

n. 

2. outdoors.

WordReference Random House Unabridged Dictionary of American English © 2025

out-of-doors  (out′əv dôrz′, -dōrz′), adj. 

1. Also, out′-of-door′. outdoor.

n. 

2. (used with a sing. v.) outdoors.

• 1800–10

Collins Concise English Dictionary © HarperCollins Publishers::

out-of-doors adverb , adjective

1. (postpositive) in the open air; outside
   Also: outdoors