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amygdaloid

[ uh-mig-duh-loid ]

noun

, Petrology.
  1. a volcanic rock in which rounded cavities formed by the expansion of gas or steam have later become filled with deposits of various minerals.


adjective

  1. (of rocks) containing amygdules.
  2. Anatomy. of or relating to an amygdala.

amygdaloid

/ əˈmɪɡdəˌlɔɪd /

noun

  1. a volcanic igneous rock containing amygdales
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


adjective

  1. having the shape of an almond
  2. a less common form of amygdaloidal
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of amygdaloid1

1785–95; < Latin amygdal ( a ) almond + -oid
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Example Sentences

Chalcedony, apparently from amygdaloid of the trap formation, was also found at Port Warrender.

Quartz crystals, with chalcedony, from nodules in amygdaloid.

Purplish-brown epidote, with small nests or concretions of green epidote and quartz; forming a sort of amygdaloid.

Masses of the two former minerals were also found imbedded in amygdaloid and trap-rock, thus denoting the parent beds of rock.

It is found in connection with isolated blocks of amygdaloid, of primitive greenstone, and of petrosilex.

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amygdalineamygdaloidal