epithelium

American  

[ep-uh-thee-lee-uhm] / ˌɛp əˈθi li əm /

noun

Biology.

epitheliums, plural epithelia plural

1. any plant or animal tissue that covers a surface or lines a cavity, and that also performs any of various secretory, transporting, or regulatory functions.

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epithelium British  

/ ˌɛpɪˈθiːlɪəm /

noun

1. an animal tissue consisting of one or more layers of closely packed cells covering the external and internal surfaces of the body. The cells vary in structure according to their function, which may be protective, secretory, or absorptive

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epithelium Scientific  

/ ĕp′ə-thē′lē-əm /

epithelia plural

1. The thin, membranous tissue that lines most of the internal and external surfaces of an animal's body. Epithelium is composed of one or more layers of densely packed cells. In vertebrates, it lines the outer layer of the skin (epidermis), the surface of most body cavities, and the lumen of fluid-filled organs, such as the gut or intestine.

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Other Word Forms

Derived Forms

• epithelial
  adjective

Inflected Forms

Nouns

• epithelia
  plural
• epitheliums
  plural

Etymology

Origin of epithelium

First recorded in 1740–50; from New Latin, from Greek epi- epi- ( def. ) + thēl(ḗ) “teat” + New Latin -ium -ium ( def. )

Compare meaning

How does epithelium compare to similar and commonly confused words? Explore the most common comparisons:

• endothelium vs. epithelium

Example Sentences

See Examples For:

epithelium epithelia epitheliums

"Barrett's esophagus is characterized by the replacement of the resident squamous epithelium of the esophagus by other cell types that are not normally found in this tissue," says the scientist.

From Science Daily ● Apr. 11, 2024

The inhaled air is trapped on the olfactory epithelium and/or the Jacobson’s organ, giving kitties an extra chance to detect scent molecules.

From National Geographic ● Jan. 2, 2024

"Repair-specific proliferative cells mainly contribute to the epithelium -- the thin outer layer -- of the newly formed tentacle."

From Science Daily ● Dec. 22, 2023

The trachea is lined with ciliated pseudostratified columnar epithelium with goblet cells.

From Textbooks ● Jan. 1, 2015

Clearly I did, because here I am at his kitchen table with the fragrance of an omelet smothered in some kind of tomatoey-oniony-garlicky sauce tickling my olfactory epithelium.

From "Odd One Out" by Nic Stone

"The squamous epithelia of the esophagus and the columnar epithelia of the stomach meet at the gastroesophageal junction," explains Dr. Naveen Kumar Nirchal, one of the first authors of the study.

From Science Daily ● Apr. 11, 2024

"Our results therefore suggest that, while protecting epithelia, mucus constitutes a breeding ground for biofilms," they explain.

From Salon ● Aug. 5, 2023

"Our results therefore suggest that, while protecting epithelia, mucus constitutes a breeding ground for biofilms."

From Salon ● Aug. 5, 2023

Stratified layers of squamous epithelia facilitate gas, nutrient or waste exchange, whereas single layers provide protection and are replaceable following damage.

From Textbooks ● Jun. 9, 2022

There may even be odorants that fire off receptors in our olfactory epithelia without our being conscious of smell, including signals exchanged involuntarily between human beings.

From "The Lives of a Cell" by Lewis Thomas

Inwardly he was lined with cast-off epitheliums, as outwardly he was clad in the painter's discarded coats.

From The Troll Garden and Selected Stories by Cather, Willa Sibert