American Heritage Dictionary
(3)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
For a time it is kept down by the vast weight of the lava which is over it, but after a time the elastic force of it gets so great that a bubble of it bursts up, and comes out at the top of the mountain in a great, thundering puff, bringing up some portion of the melted lava with it, and throwing it high into the air The lava thus thrown up falls down again, and when there is no wind it falls down close around the opening.— Rollo in Naples
The trees on the northern edge of the lava were already on fire.— Personal Recollections, from Early Life to Old Age, of Mary Somerville
It moved slowly but steadily downwards like genuine lava, and in the course of a few hours swept some hundreds of cocoa-nut trees, a yam ground, containing nearly a thousand yams, one of the canoes, and a great mass of heterogeneous material, over the cliffs into the sea.— The Lonely Island The Refuge of the Mutineers
I think they concluded that the floor of the cavern may have been formed by a sheet of lava, and that thus a natural basin was created.— My First Voyage to Southern Seas
I don't see that we need concern ourselves further about the matter It may be so," replied Cyrus Harding, "for the ancient track of the lava is still open; and thanks to this, the crater has hitherto overflowed towards the north.— The Secret of the Island

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 once a week.