Urimalsaem is an online, open source, and collaborative Korean language dictionary.

Reviewers are generally lexicographers or linguists, who not only approve words, but remove duplicate definitions and formalize terms.

[5] All of its content, unless otherwise specified, is offered under the Creative Commons license Attribution-ShareAlike 2.0 Korea (CC BY-SA 2.0 KR), which allows for all use, including commercial, although attribution is required even if the material is transformed.

[9][5] A 2020 study that examined neologisms from the years 2005–2009, as well as 2018, found that Urimalsaem was best able to capture neologisms when compared to the NOD, Standard Korean Language Dictionary (SKLD), and the Korea University Korean Dictionary (KUKD) for all years except 2006.

[5] Urimalsaem even uniquely captured terms like "Pence-rule" (펜스 룰),[5] referring to a controversial statement U.S. Vice President Mike Pence made about not being alone with a woman so that one can avoid false accusations of sexual harassment.