“Writing is not only a great way to discover what we are thinking, it is also a way to uncover lacunae in our thinking. Unfortunately, that means we must be prepared to catch ourselves red-handed when we seem not to be thinking at all. The fact should not escape us that when the writing is not going well, our still-nebulous thoughts are not yet ready to be expressed in words.”
--Harry Wolcott
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Here's a link for one word that includes pronunciation: http://dictionary.reference.com/browse/lacunae