sunglasses

sun·glasses [sunglasses] [ˈsʌnɡlɑːsɪz] [ˈsʌnɡlæsɪz] (also informal shades) noun plural
a pair of glasses with dark glass in them that you wear to protect your eyes from bright light from the sun
• a pair of sunglasses
see also dark glasses
Example Bank:
• Her sunglasses were perched on her head.

• She observed the goings-on from behind her mirrored sunglasses.

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition

sunglasses / ˈsʌŋˌɡlɑː.sɪz / / ˈsʌnˌɡlæs.ɪz / noun [ plural ] ( also ˌ dark ˈ glasses , informal shades )

A2 dark glasses that you wear to protect your eyes from bright light from the sun:

a pair of sunglasses

Collins COBUILD Advanced Learner’s English Dictionary

sunglasses

/sʌnglɑ:sɪz, -glæs-/

Sunglasses are glasses with dark lenses which you wear to protect your eyes from bright sunlight.
She slipped on a pair of sunglasses.

N-PLURAL: also a pair of N

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary:

sunglasses

sun·glass·es /ˈsʌnˌglæsəz, Brit ˈsʌnˌglɑːsəz/ noun [plural] : glasses with dark lenses that protect the eyes from the sun
• a pair of sunglasses
- called also (informal) shades,

noun