aqueous humor

noun

: a transparent fluid occupying the space between the crystalline lens and the cornea of the eye

Examples of aqueous humor in a Sentence

Recent Examples on the Web
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The light passes through your eye’s anterior cavity (full of fluid known as aqueous humor), and then enters your pupil. Ethan Siegel, Big Think, 19 Aug. 2025 In a healthy eye, excess aqueous humor exits through the trabecular meshwork, which are canals located between your iris (the colored part of the eye) and cornea (the clear outer portion). Mark Gurarie, Health, 3 Oct. 2024 The fluid inside the eye (in the part of the eye called the aqueous humor) drains through structures in the eye called the trabecular meshwork. Dr. Keith Roach, oregonlive, 4 Oct. 2022

Word History

First Known Use

1638, in the meaning defined above

Time Traveler
The first known use of aqueous humor was in 1638

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Cite this Entry

“Aqueous humor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aqueous%20humor. Accessed 6 Jul. 2026.

Kids Definition

aqueous humor

noun
: a clear fluid between the lens and the cornea of the eye

Medical Definition

aqueous humor

noun
: a transparent fluid occupying the space between the crystalline lens and the cornea of the eye

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