B.
- Bigender - A person whose sense of personal identity encompasses two genders.
- Binder - A garment used mainly by trans-masculine people to compress their breasts to give the appearance of having a flat chest.
- Binarism - The erasing or antagonizing of people whose genders are outside of the gender binary in indigenous and colonized cultures.
- Biological Sex - A medical term referring to one's personal combination of gonads, chromosomes, external organs, secondary sex characteristics and hormonal balances.
- Bottom Surgery - A broad term referring to surgeries relating to genitalia.
- Boy Mode - Appearing to the world as a boy or man, regardless of true gender.
- Breast Augmentation - Cosmetic procedure to increase the size of breasts with silicon implants.
- Breast Forms - Artificial breasts, mainly used by trans-feminine people, to give the appearance of having breasts.
- Breasts - Either of two milk-secreting, glandular organs on the chest.
- Butch - Having an appearance or other qualities of a type traditionally seen as masculine.
- Butchphobia - The dislike or hatred of butch women.
