Definition

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Before we proceed with the definition, lets get to know what is the chromosome of a normal men normal women. 

Figure 1.0: Illustration for normal man and women chromosome 

A normal man body contain 23 pairs of chromosome (46 XY) and also known as 'Heterogametic' while a normal woman  have a normal gene which contain 23 pairs of chromosome (46 XX)which also known as 'Homogametic'.

Granting to the researches, it had been found that,  Swyer syndrome is a rare disorder characterized by the failure of the sex glands (i.e., Testicles or ovaries) to germinate. Swyer syndrome is classified as a disorder of sex development or a DSD, which encompasses any disorder in which chromosomal, gonadal or anatomic sex development is abnormal. 

Girls with Swyer syndrome have an XY chromosomal makeup (as boys commonly do) instead of an XX chromosomal make-up (as girls usually do). Despite having the XY chromosomal makeup, girls with Swyer syndrome look female and have functional female genitalia and structures, letting in a vagina, womb and Fallopian tubes. 

In other words, the patient was turned out with a male chromosome (gene 46 XY) but they subsist in a normal and typical physical appearance and individuality as a female!  And they are actually a male who survives in the female body because they deliver a female crotch! 

Figure1.1 : Example of physical looks of a male born with a female types of gene (46 XX). He also had to removes his gonadal streaks.