1
: a large pendulous organ consisting of two or more mammary glands enclosed in a common envelope and each provided with a single nipple see cow illustration
2
Examples of udder in a Sentence
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For example, milk can be contaminated by manure or environmental filth, infections of the udder such as mastitis or from surfaces during the milking process.
—
Katia Hetter, CNN Money, 1 Apr. 2026
The virus targets the mammary gland's milk-secreting epithelial cells, causing painful infections in the udder.
—Pranjal Malewar, New Atlas, 3 Nov. 2025
Cow udders may offer one venue for such a hybrid virus to develop.
—Meghan Bartels, Scientific American, 24 Oct. 2025
The shortest razor is used on the cow's udders.
—Kelly Meyerhofer, jsonline.com, 3 Oct. 2025
See All Example Sentences for udder
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Katia Hetter, CNN Money, 1 Apr. 2026
The virus targets the mammary gland's milk-secreting epithelial cells, causing painful infections in the udder.
—Pranjal Malewar, New Atlas, 3 Nov. 2025
Cow udders may offer one venue for such a hybrid virus to develop.
—Meghan Bartels, Scientific American, 24 Oct. 2025
The shortest razor is used on the cow's udders.
—Kelly Meyerhofer, jsonline.com, 3 Oct. 2025
See All Example Sentences for udder
Cite this Entry
“Udder.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/udder. Accessed 5 Apr. 2026.
Copy CitationKids Definition
udder
noun
ud·der
ˈəd-ər 
1
: a large bag-shaped organ (as of a cow) consisting of two or more mammary glands enclosed in a common pouch but with each having a separate nipple
2
: a mammary gland
Medical Definition
udder
noun
ud·der
ˈəd-ər
: a large pendulous organ in various mammals and especially a female domestic bovine consisting of two or more mammary glands enclosed in a common envelope and each provided with a single nipple
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