Amygdaloid – Definition & Meaning

The term amygdaloid is one that is not commonly used in everyday conversation. It is a term that is primarily used in the fields of geology and anatomy. Despite its limited use, it is still important to understand what it means and how it is used.


The term amygdaloid is used in geology to describe a type of volcanic rock that is formed from lava flows. This type of rock is characterized by its small, rounded cavities that are filled with minerals such as zeolites, calcite, or quartz. In anatomy, the term amygdaloid refers to a part of the brain called the amygdala, which is responsible for processing emotions.


The term amygdaloid comes from the Greek word amygdalē, which means almond. This is because the amygdala in the brain is shaped like an almond. The term was first used in the field of geology in the early 19th century to describe the unique characteristics of this type of volcanic rock.

Meaning in different dictionaries

According to the Merriam-Webster dictionary, amygdaloid refers to “a volcanic rock characterized by numerous amygdules”. The Oxford English Dictionary defines it as “a volcanic rock containing amygdules”. Both definitions focus on the geological aspect of the term.


The term amygdaloid is primarily associated with geology and anatomy. In geology, it is used to describe a specific type of volcanic rock. In anatomy, it refers to a part of the brain that is responsible for processing emotions.


There are several synonyms for amygdaloid, including amygdule, vesicular basalt, and scoria. These terms are also used to describe volcanic rocks that have small cavities filled with minerals.


There are no direct antonyms for amygdaloid, as it is a specific term used to describe a type of volcanic rock. However, other types of volcanic rock such as basalt and andesite can be used as a point of comparison.

The same root words

The root word of amygdaloid is amygdala, which is a part of the brain that is responsible for processing emotions. The term is also related to the Greek word amygdalē, which means almond.

Example Sentences

  1. The amygdaloid rock formation in this area is quite unique and attracts many geologists.
  2. The amygdala is an important part of the brain that plays a role in processing emotions.
  3. The amygdules in this vesicular basalt are filled with beautiful crystals.
  4. The scoria found in this area is not as porous as the amygdaloid rock that is found elsewhere.
  5. The amygdaloid shape of the amygdala is what gives it its name.
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