S.

Salmacian - One who wishes to have or has already obtained a mixed genital set through surgical means.

Salphingectomy - The removal of the fallopian tubes. A common form of sterilization.

Salpingo-Oophorectomy - The removal of both the fallopian tubes and the ovaries.

Seahorse Dad - Refers to a transmasculine person who chooses to undergo pregnancy.

Secondary Sex Characteristics - Anatomical features that develop during puberty, and which are related to sex hormones but not directly involved in reproduction. Examples include facial hair and rounded breasts.

Sex Assignment - The process by which one's biological sex is determined at birth.

Sex Change - An outdated and inaccurate term for what is now called transitioning.

Sex Reassignment Surgery - An outdated term for what is more properly called gender confirmation surgery or gender affirmation surgery.

Sexuality - The quality of being sexual, especially sexual orientation and behavior.

Sexual Orientation -
1. The group of people or genders to which a person can become sexually attracted, if at all.
2. The direction of a person's sexual interest.
Shaving - A method of hair removal involving a razor.

S.I.G. - Socially Imposed Gender (Note: This term is usually reserved for those who are intersex.)

Singular They - Yes, this is grammatical. “They” is a convenient way to refer to a person of uncertain gender, or whose preferred pronouns are unknown. Some people also adopt “they” as their preferred pronouns.

Situational Genderfluid - Someone who is situationally genderfluid moves between genders based on their environment. As a sub-section of genderfluid, it implies a pattern.

Social Dysphoria - In trans discussions, dysphoria that is caused by being perceived or treated by other people as an incorrect gender.

Social Transition - When someone changes their name, pronouns, hairstyle, and clothing to be more gender affirming in their pursuit of gender euphoria.

Spironolactone - A testosterone blocker often taken by trans-feminine individuals as a part of HRT.

Standards of Care - Full name: “Standards of Care for the Health of Transsexual, Transgender, and Gender Nonconforming People.” These are non-binding guidelines that influence the decisions of many doctors and other gatekeepers in determining whether trans people are allowed to get transitional medical care. Often criticized for being overly strict, for preventing trans youth from transitioning, and for compelling nonbinary trans people to hide or lie about their experiences in order to receive treatment.

Stealth - When a transgender person lives and generally passes as their true gender without disclosing that they are trans. This can be done either for personal or safety reasons (or a combination of both).

Stand-To-Pee - A device used to enable someone to urinate while standing up, in the manner that cis men often do.

Surgeons - Those responsible for "the surgery." Which surgery? It depends on who you ask.

Surgical Transition - When one undergoes surgical procedures in an effort to obtain gender euphoria.

Sworn Virgins - A person who chooses to avoid sex and live as the binary gender opposite of that assigned to them at birth. Usually used to refer to a traditional social role in Albania and Montenegro, which does not have an exact Western equivalent.

Synthetic Hormones - Hormones with a chemical structure that differs from the natural hormones produced by the body. These are produced in a lab.