American Heritage Dictionary
(2)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
That towline must remain slack or the manta will dive under the water.— Scientific American
But what is best about the iQ is its eye-catching design, inspired by curves and texture from nature, such as the conch shell and manta ray, making it stylish and fun, Nakajima said.— SouthCoastToday.com Latest Headlines
And the crocodile winking eyes of manta rays that thought I could not see them buried beneath the bone white sand at the bottom.— Reluctant Memsahib

American Heritage Dictionary (1)
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 about twice a year.
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