'Intersexual' and 'hermaphrodite' refer to people intermediate in sex, 'androgyne' to people intermediate in gender.

Arenotelicon
A creature that alternates between male and female. This word is so obscure it is not even in the O.E.D.; as far as I know it occurs only in the Physiologus, an anonymous book of the early Renaissance. The Physiologus uses it to describe hyenas, which were commonly believed to change their sex every year; it would apply equally well to Ursula LeGuin's Gethenians.

Epicene
adj. and n. 1. (of words) indicating either sex with only one grammatical form; 2. partaking of the characteristics of both sexes; 3. common to both sexes; worn or inhabited by both sexes.

This word has taken on a variety of figurative meanings over the centuries (Ben Jonson used it to mean something like 'effeminate'); still, more than any other word I know of, it emphasizes what is common to both sexes. Its Greek root means 'common,' and it shows up in descriptions of garments that either sex can wear, or places both sexes dwell ('Epicene...Convents, wherein Monks and Nuns lived together.' -- Fuller, c.1661). It is probably preferable to 'androgyne' for the meaning ANDROGYNE 3 (see above).

The compiler of this Dictionary thinks of zirself less as a combination of male and female, than as the greatest common denominator of male and female; hence zie rather likes this term to describe zirself. Alas, it will probably never catch on. See the section Not This, Not That: A Meditation on Labels.

Gender
n. Sex is a set of biological differences between people; gender is a set of social statuses built on the backs of those differences. That, at least, is the brief definition; see What is Gender for a longer one.

Some people, however, use gender to mean sex. This inconsistency in usage can lead to great confusion. One day I plan to compile a summary of harmful interactions between meanings; but not yet.

Gender Dysphoria
n. The state of discontentment with one's biological sex or sex-of-rearing. Not all transgendered people are gender dysphoric. (Some could only be described as gender euphoric.)

Genderfuck
n. (also v.): 1. Deliberately sending mixed messages about one's sex, usually through dress (e.g., wearing a skirt and a beard).

The compiler of this Dictionary likes the thing well enough, but finds the term too violent. Perhaps 'gender play.'

Gender Outlaw
(Kate Bornstein) A person who defies traditional gender roles.

Gynandroid
n. 1. A synonym for androgyne; now little used, but it's in the OED. 2. Brent Spiner's child by Whoopi Goldberg.

Hermaphroditus
n. 1. A youth in Greek myth, the son of Hermes and Aphrodite, who was joined in one body with the nymph Salmacis while bathing. The best-known telling of this story is in Ovid's Metamorphoses.

Necker Cube
n. 1. An optical illusion in the shape of a cube. May take either of two forms:

Proposed by the author as a symbol of androgyny, because it is either concave or convex depending on how you look at it. I prefer this to the mars-plus-venus sign, which depends upon a juxtaposition of stereotpyes (sword and shield for male, looking-glass for female), and which, furthermore, combines the signs for the two most irritating gods in the Roman pantheon. If we must depend on Greek mythology, I would prefer to take a cue from Janus and use some variation of the two-faces motif on the cover of some editions of The Left Hand of Darkness. The Necker cube, however, is simpler, and suggests ambiguity in more than mere gender. Who wants to design the lapel pin?

Radar
v. Used by the author to describe the stuttering of pronouns or honorifics owing to gender confusion. Named for Radar O'Reilly's invariable "sir, ma'am, sir" when addressing Major Hoolihan. Also suggests the scanning motion of the eyes that often accompanies the stutter.

sex
n. 1. A classification based on reproductive biology. Most people think of sex as wholly bipolar, with male and female as the only possibilities; more precisely, it is a continuum with most individuals concentrated near the poles.

Sie, hir
pron. Gender-free pronouns, used chiefly on the Internet.

SRS
n. Sex Reassignment Surgery. This is the generally preferred term for what is colloquially referred to as a 'sex change operation.' The compiler of this Dictionary, however, has a sneaking admiration for Kate Bornstein's phrase 'genital conversion surgery.'

Tiresias
n. In Greek mythology, a blind seer of Thebes who is changed into a woman for several years, then changed back to a man. In one story, Zeus and Hera ask Tiresias to settle a wager as to whether men or women get more pleasure from sex. This myth predates Geraldo by some two thousand years.