Johns Hopkins University has fueled outrage for calling lesbians "non-men" in its updated glossary of LGBTQ terms. 

Prominent Twitter users including J.K. Rowling and others ripped the college for the entry, accusing the well-known medical research school of erasing women with the new definition. 

Users spotted the entry Monday while reading through the "LGBTQ Glossary" posted on Johns Hopkins University’s "Gender and Sexuality Resources" webpage.

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The A-Z list featured a series of LGBTQ-related terms and their definitions – from "AFAB (Assigned Female at Birth)" to "WSW," an "abbreviation for women who have sex for women."

Critical readers voiced most concern over the definition of "Lesbian," which read, "A non-man attracted to non-men."

The entry noted the reason why the school guide wasn’t using Lesbian to define relationships between "women," claiming that isn’t exclusive enough.

It added, "While past definitions refer to ‘lesbian’ as a woman who is emotionally, romantically, and/or sexually attracted to other women, this updated definition includes non-binary people who may also identify with the label."

The entry for "Gay Man" however referred explicitly to "men" and didn’t provide a more inclusive term for LGBTQ people who may identify with the label.

That definition read, "A man who is emotionally, romantically, sexually, affectionately, or relationally attracted to other men, or who identifies as a member of the gay community. At times, ‘gay’ is used to refer to all people, regardless of gender, who have their primary sexual and or romantic attractions to people of the same gender. ‘Gay’ is an adjective (not a noun) as in ‘He is a gay man.’"

"Harry Potter" author J.K. Rowling, a feminist opposing what she sees as the trans movement erasing women, mocked the two seemingly inconsistent definitions on Twitter. 

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She tweeted, "Man: no definition needed. Non-man (formerly known as woman): a being definable only by reference to the male. An absence, a vacuum where there's no man-ness."

Commentator and out lesbian Arielle Scarcella made the same point, asking, "Why is a lesbian a non-man but a gay person isn’t a non-woman? Progressive misogyny?"

Conservative influencer @LibertyAnders remarked, "New progressive definition of woman just dropped: We are now ‘non-men’."

Conservative Twitter commentator Amy Curtis tweeted, "What is this absolute nonsense @JohnsHopkins? ‘Non-men’? We are women. Stop erasing us."

Satire account Titania McGrath quipped, "Thank you @JohnsHopkins for reminding us that ‘woman’ is an outdated and offensive term. From now on, the phrase is ‘non-man’.

Al Jazeera reporter Sonia Gallego remarked, "One of the most prestigious universities in the US @JohnsHopkins is actively destroying the category of women - adult human females. We are now to be referred to as ‘Non-men’. I don’t think even @MargaretAtwood could have imagined this.".

Fox News Digital reached out to Johns Hopkins University for comment on the controversy and is waiting for a response.