• WordNet 3.6
    • adj amygdaloidal shaped like an almond
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Webster's Revised Unabridged Dictionary
    • Amygdaloidal Almond-shaped.
    • Amygdaloidal Pertaining to, or having the nature of, the rock amygdaloid.
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Century Dictionary and Cyclopedia
    • amygdaloidal Same as amygdaloid; specifically, in geology, having a cellular or vesicular structure: said of lava, whether of modern or ancient origin, in which spherical or almond-shaped (whence the name) cavities were formed by the expansion of steam contained in the rocks at the time of its consolidation, and which have later become filled with various minerals, especially quartz, calcite, or the zeolites. The rock having this character is called an amygdaloid, and the cavities themselves, as thus filled by the percolation of heated water through the body of the rock, are called amygdules.
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In literature:

At one part we have breccia of altered marl or slate in quartz, and various amygdaloids.
"Missionary Travels and Researches in South Africa" by David Livingstone
I ascended one, and found it was capped with trap rock in amygdaloidal nodules.
"Journal of an Expedition into the Interior of Tropical Australia" by Thomas Mitchell
Observed amygdaloid under foot among the granite, and sandstone boulders.
"Personal Memoirs Of A Residence Of Thirty Years With The Indian Tribes On The American Frontiers" by Henry Rowe Schoolcraft
The structure in one of these specimens approaches to the amygdaloidal.
"Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2]" by Phillip Parker King
The soil was mixed with pebbles of vesicular trap, probably amygdaloid with the kernels decomposed, and containing particles of olivine.
"Three Expeditions into the Interior of Eastern Australia, Vol 1 (of 2)" by Thomas Mitchell
Vesicular lava and amygdaloid are the chief ingredients of some of the best parts of Australia Felix.
"Three Expeditions into the Interior of Eastern Australia, Vol 2 (of 2)" by Thomas Mitchell
Mr. Collins found the bank composed of amygdaloid sand, decomposed rock and sandstone, with many traces of iron.
"Overland through Asia; Pictures of Siberian, Chinese, and Tartar Life" by Thomas Wallace Knox
A nodule of amygdaloid, a coarse pebble enveloped in a whitish semi-crystalline paste, lies on the table before me.
"Lippincott's Magazine of Popular Literature and Science, Vol. XII. No. 31. October, 1873." by Various
It rings upon rocks of amygdaloid and porphyry.
"The Rifle Rangers" by Captain Mayne Reid
Crystals are found as a rarity in the amygdaloidal cavities of igneous rocks.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 3" by Various
This solid nucleus is covered by a kind of porous amygdaloid, called tetzontli.
"Incentives to the Study of the Ancient Period of American History" by Henry R. Schoolcraft
Chabazite occurs with other zeolites in the amygdaloidal cavities of basaltic rocks; occasionally it has been found in gneisses and schists.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7" by Various
Porphyrites are usually porphyritic, and frequently amygdaloidal.
"Geology" by James Geikie
The geological formation is granite, gneiss, trap, and amygdaloid.
"Twenty-Five Years in a Waggon in South Africa" by Andrew A. Anderson

In news:

The Fun Years Cornelia Amygdaloid.

In science:

These are: posterior calcarine sulcus (PCS), fusiform gyrus (FG) and the amygdaloid complex (AM).
Asymmetric random matrices: What do we need them for?
Brain Res. 804, 212-223. Heggli, D. E., Malthe-Sörenssen, D., 1982. Systemic injection of kainic acid: effect on neurotransmitter markers in piriform cortex, amygdaloid complex and hippocampus and protection by cortical lesioning and anti-convulsants.
Nimesulide limits kainate-induced oxidative damage in the rat hippocampus