Picture one thing that holds both sides at once: the male and the female sitting together in a single body, a single face, a single name. Nothing has been left out and nothing has been mixed into a third thing; two things we usually keep in separate boxes are simply in the same place. Because both are there, the eye or the ear has no way to sort it into one box, and that is what every use of the word comes back to.
From the word’s history
From Latin androgynus, from Ancient Greek anēr (man) plus gunē (woman) plus the adjective ending -os/-ous. The word is literally man-woman, so the picture of two sides in one thing is built into its parts.
來自拉丁文 androgynus，再往前是古希臘文 anēr（男人）加 gunē（女人），加上形容詞字尾。字面就是「男—女」，所以「兩邊在同一個東西身上」這個畫面，本來就寫在字的零件裡。
Wiktionary, "androgynous"
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