People have 2 arms and 2 legs with 5 fingers/toes at the end of each. This is a fact, not changed by the fact that indeed there are some people with more than 5 fingers/toes, some with fewer or even none at all. Those people are the exception to the rule.
In the same vein a woman is an adult human female, characterised by having double-X chromosomes, producing large gametes and generally being capable of conceiving and nursing children. The presence of people with a double-X + Y chromosome (who are, in fact, men, not women, search for 'Klinefelter syndrome' [1]) does not change this fact, nor does the fact that some women - yes, of course they are still women - can not conceive or nurse children.