One of the easiest ways of checking for the spelling of a single word when on the move and not requiring a whole document to be spell checked is to say the word into a smart phone or tablet. As long as you have one of the fairly recent versions of Android, iOS iPhone or iPad or Windows, they all have built in speech recognition.  I am showing an example of how it works on an iPhone with Siri and this iOS5 hot tip has been on the web since 2012. There is an Android tutorial on using Speech to Text and one for Windows Surface speech recognition

I said to Siri – “spell /filosofical/” (spelt as said) – It not only repeated the word back to me with text to speech, but also gave me the correct spelling and dictionary definition.  If I just said the word it gave me the text to speech version back and a collection of links such as the word in Wikipedia.

This comes thanks to Annie – dyslexic researcher, University of Southampton.