American Heritage Dictionary
Century Dictionary
(2)
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
This event is thus called a penumbral Groundhog Day, meaning six more weeks of winter.— Museum Blogs
A penumbral eclipse in the run up to Valentine's Day suggests that, in a strange way, you may be better off accepting that you are out of your depth in a key area of life and deciding to stop trying so hard to understand and control everything.— NEWS.com.au | Top Stories
The moon, in penumbral eclipse this week, is pushing you to look at what you have been trying to ignore.— NEWS.com.au | Top Stories
The eclipse is not that interesting as it is a penumbral eclipse.— Kottu
The historian, of course, will discover in addition a penumbral area occupied by achievements whose status is still in doubt, but the core of solved problems and techniques will usually be clear.— LearnHub Activities

Century Dictionary (1)
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