• WordNet 3.6
    • n thunderhead a rounded projecting mass of a cumulus cloud with shining edges; often appears before a thunderstorm
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Webster's Revised Unabridged Dictionary
    • n Thunderhead A rounded mass of cloud, with shining white edges; a cumulus, -- often appearing before a thunderstorm.
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Century Dictionary and Cyclopedia
    • n thunderhead One of the round compact swelling cumulus clouds which frequently develop into thunder-clouds. The thunder-head is seen at first, perhaps, on the horizon, of a brilliant whiteness; then, slowly rising, and darkening until only a silver edge is left of its brightness, it becomes a towering mass of black thunder-cloud.
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In literature:

It had been a hot day, with great thunderhead, black and creamy white clouds rolling down from the canyon country.
"Wildfire" by Zane Grey
The thunderheads they had seen earlier in the day now spread and covered the whole sky with a dark pall.
"The Boy Inventors' Radio Telephone" by Richard Bonner
Then a majestic thunderhead in the blazing September sky caught his attention and the miracle happened.
"A Son of the City" by Herman Gastrell Seely
The sky darkened as the glistening thunderheads now taking on an ominous coloring warned the farmers of the impending storm.
"The White Feather Hex" by Don Peterson
Great thunderheads rose over the mainland, proclaiming heat on the desert.
"Tales of Fishes" by Zane Grey
The day had been very hot, and the west had piled up some threatening thunderheads.
"The Price of the Prairie" by Margaret Hill McCarter
He spotted Garret diving for a great thunderhead.
"A Yankee Flier with the R.A.F." by Rutherford G. Montgomery
There was a heavy mass of thunderheads in the sky, and few stars showed through.
"The River Motor Boat Boys on the Mississippi" by Harry Gordon

In news:

With humidity and dew points on the rise, and thunderheads building in the afternoon heat, the atmosphere is signaling a change.
A thunderhead bubbles up near Broad Run, Va. (Jennifer Reed) Cold air high in the sky combined with toasty air near the ground gave rise to atmospheric volatility all week long.
A thunderhead drifted west of the Varsity Baseball Field , last Friday shortly, after sunset during the American Legion Post 33's baseball game.
37 Golden Fraü Honey Wheat: Thunderhead Brewing, Kearney, NebraskaState: The Cornhusker state.
37 Golden Fraü Honey Wheat: Thunderhead Brewing, Kear.
This large thunderhead was part of a rash of storms across the Texas Panhandle on Oct 13, 2012.
Thunderhead .com, a customer experience management company, has launched its SaaS ONE Engagement Platform, which helps brands intelligently engage with customers and manage their journeys.
When Smoke Meets Thunderhead .
Thunderhead Brewing, Kearney, Nebraska.
Thunderhead Click to enlarge.
Kemper's P&C units are deploying a centralized shared service for claims correspondence and policy assembly using the Thunderhead CCM solution.
Thunderhead over Bull Basin in Plateau Valley south of Molina combined with evening sun to produce a nice rainbow event.
Thunderhead & rainbow Click to enlarge.
Thunderhead Photography Tennessee Smokies manager Buddy Bailey signals from third base during a game on May 15 at Smokies Park.
The Thunderheads return to the Roadhouse.

In science:

Lorenz as a simplified model for atmospheric turbulence in a vertical air cell beneath a thunderhead .
Algorithmic Integrability Tests for Nonlinear Differential and Lattice Equations