American Heritage Dictionary
(3)
Century Dictionary
(1)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
• Dawn of the Space Age featured in the planetarium, along with Tonight's Sky,
For the teacher, it's not all about science; the familiar white dome of the center's planetarium is also a social resource for his students, some of whom rarely leave their neighborhood.— Tucson Weekly
I'm sorry, did he call a planetarium "foolishness"?— Bad Astronomy
Now where I grew up (rural central PA) was nowhere near a planetarium, and it doubt it would have made any difference to me had there been nearby.— Propeller Most Popular Stories
Replete with a casino, a nightclub, a spa, a wine bar, 15 restaurants and bars, a library, and even a planetarium -- this ship makes the Titanic look like a kayak.— digg.com: Stories / Popular

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word several times a year.
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