American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
WordNet
Elsewhere on the web
"Do not look now, my gaydar is beeping".— Answerbag: Latest Questions in Question Categories
I guess he's gay .. the dictionary definition of gaydar is a homosexual's sensing ability to find other *****.— digg.com: Stories / Popular
"gaydar," you wouldn't know it.— Classical Values
But the question about how best to use online cruising web sites like gaydar is a good one: -).— Gay Banker
Btw, my gaydar is the stuff of legends.— Good As You
Gaydar has been looked up 142 times, favorited once, listed 11 times, and commented on 7 times.

American Heritage 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 about once a year.
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