How to remove a word from the dictionary (Chrome, Mac OS X)
This trick works for any program on the Mac which uses the default dictionary (the same one that TextEdit, Mail, and the other built-in programs use). So when I accidentally added a misspelled word to the dictionary in Google Chrome, I wanted to remove it. Here's how:
Type the misspelled word
Right-click it and click "Unlearn Spelling"
Done! Works across-the-board on Mac OS 10.5 (I'm pretty sure), and higher -- I am running Mountain Lion.