pseudocoelom

noun

pseu·do·coe·lom ˌsü-də-ˈsē-ləm

variants or pseudocoel

ˈsü-də-ˌsēl

plural pseudocoeloms or pseudocoels

: a body cavity that is not a product of gastrulation and is not lined with a well-defined mesodermal membrane

First Known Use

1863, in the meaning defined above

Time Traveler

The first known use of pseudocoelom was in 1863

See more words from the same year

Pseudococcus

pseudocoelom

Pseudocoelomata

See all Nearby Words

Style

“Pseudocoelom.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pseudocoelom. Accessed 4 Nov. 2025.

Copy Citation

pseudocoelom

noun

pseu·do·coe·lom ˌsüd-ə-ˈsē-ləm

variants or pseudocoel also pseudocele or pseudocoele

ˈsüd-ō-ˌsēl

: a body cavity (as in various worms) that is not the product of gastrulation and is not lined with a well-defined mesodermal membrane