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a volcanic rock in which rounded cavities formed by the expansion of gas or steam have later become filled with deposits of various minerals.
(of rocks) containing amygdules.
.
anatomy. of or relating to an amygdala.
historical examples

they are composed of clay mixed with gravel, and covered with a wall of amygdaloid.
diplomatic days edith o’shaughnessy

it is found in connection with isolated blocks of amygdaloid, of primitive greenstone, and of petrosilex.
summary narrative of an exploratory expedition to the sources of the mississippi river, in 1820 henry rowe schoolcraft

chalcedony, apparently from amygdaloid of the trap formation, was also found at port warrender.
narrative of a survey of the intertropical and western coasts of australia] [volume 2 of 2] phillip parker king

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) thomas mitch-ll

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 thomas wallace knox

i have never yet seen a rock in which this earth was so abundant as in the amygdaloid of scuir more.
the cruise of the betsey hugh miller

she listens as to a fairy tale, and then i tell her of the stellar crystals concealed in the rough crust of the amygdaloid.
lippincott’s magazine of popular literature and science, vol. xii. no. 31. october, 1873. various

i climb thy mountains of amygdaloid and porphyry—thy crags of quartz, that yield the white silver and the yellow gold.
the war trail mayne reid

m-sses of the two former minerals were also found imbedded in amygdaloid and trap-rock, thus denoting the parent beds of rock.
summary narrative of an exploratory expedition to the sources of the mississippi river, in 1820 henry rowe schoolcraft

the houses present a magnificent appearance, being built of porphyry and amygdaloid.
early western travels 1748-1846 various

noun
a volcanic igneous rock containing amygdales
adjective
having the shape of an almond
a less common form of amygdaloidal (sense 1)

amygdaloid a·myg·da·loid (ə-mĭg’də-loid’) or a·myg·da·loi·dal (ə-mĭg’də-loid’l)
adj.

shaped like an almond.

of or relating to an amygdala.