Today's word is wetware. This was created in the 1990s by analogy with hardware and software, and refers to the human brain. Merriam-Webster dfines it as "the human brain or a human being considered especially with respect to human logical and computational capabilities." Wikipedia has a much more complex definition, which refers to the way in which mind and brain interact.
The Merriam-Webster definition has the virtue of simplicity, but the disadvantage of particularly annoying pop-ups. It refers the user to Britannica Online, which has absolutely no information, but even more annoying pop-ups. You may well be able to do without this word, but if you do want to use it, the financial side of Wikipedia (a very small request for donations) is easier to handle.