Conservative MP Nadine Dorries has donned a jumper featuring the dictionary definition of a woman to show "solidarity" with women who objected to being referred to as cisgender.
The term cisgender refers to people who are comfortable in the gender they were born in, as opposed to someone who is transgender, and feels their identity does not correspond with their birth sex.
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talkRADIO's Julia Hartley-Brewer objected to being called a "cis" woman on the breakfast show, claiming it was "woman or trans woman".
Ms Dorries shared a talkRADIO article about the heated exchange, captioning it: "Go Julia! I bloody love you."
In a separate tweet, Ms Dorries shared a picture of her dictionary definition jumper with the caption: "I’m wearing this today in solidarity with Julia Hartley-Brewer.
"Will the lady who gave it to me please DM me, I want to send a thank you letter!"
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The dictionary definition of a woman has been widely used by women's rights campaigners, Standing for Women, who claim the term woman should refer only to "adult human females", and not transgender women.
Activist Kellie-Jay Keen-Minshull, a.k.a Posie Parker, a prominent campaigner for the group, organised a billboard displaying the dictionary definition of a woman in Liverpool, which was taken down after accusations it was "transphobic".