A Spell-Checker for Scientific Terms?

deaflamb wonders: "I'm a biology major and have been writing a paper for a class. I'm using Microsoft Word on my mac. It's annoying me how often I have to click 'ignore' or 'add' on the spell checker when it comes across words only used in Science. Was wondering if there where any free scientific spell checkers out there that can be added into Word or OpenOffice (since I use that too), and how well they work?" It didn't take me long to find these guys, who look like they cover a significant portion of the terms used in the medical and science world, however, their price for a single user license for only one of their specialty packs can run into the hundreds of dollars. Might there be other options that are a bit more affordable or, as the deaflamb asks, free?