All demigenders are feeling partially – not wholy as a gender.
Demiboy, also called demiguy, is someone whose gender identity is only partly male, regardless of their gender assigend at birth. They may or may not identitify as another gender in addition to feeling partially male. They may also identitfy as both male, and genderless.
A demigirl is someone who partially identifies as a female regardless of their gender assigened at birth. They may or may not identitify with another gender in addition to feeling paritally female. They may also use demigal, demifemale, and demiwoman.
Demienby, or deminonbinary, is a gender idenity for someone who partially identifies as non-binary.