Nonpuerella or Nonvirmina refers to someone who is both nonpuella and nonpuer. They are not male, partially male, or male-aligned in any way and they are not female, partially female, or female-aligned in any way. However they still experience some connection to both masculinity and femininity in their gender. It can also be described as a gender that is lingender or androgynous but is not liaspec, miaspec/male-aligned, or fiaspec/female-aligned. Nonpuerella can be used as a gender on it own, or it can be used to encompass several genders, such as censari.
Etymology
Puer is the latin word meaning "boy", while puella is the latin word meaning "girl".