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A volcanic rock containing many amygdules.
adj. also a·myg·da·loi·dal (-loi′dl)
1. Shaped like an almond.
2. Anatomy Of or relating to the amygdala.
3. Resembling a volcanic rock that contains many amygdules.

[Latin amygdala, almond; see amygdala + -oid.]


(Geological Science) a volcanic igneous rock containing amygdales
1. having the shape of an almond
2. (Geological Science) a less common form of amygdaloidal1


(əˈmɪg dəˌlɔɪd)

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.
2. Also, a•myg`da•loi′dal. almond-shaped.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.amygdaloid - volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits
volcanic rock - extrusive igneous rock solidified near or on the surface of the Earth
Adj.1.amygdaloid - shaped like an almondamygdaloid - shaped like an almond    
rounded - curving and somewhat round in shape rather than jagged; "low rounded hills"; "rounded shoulders"
References in periodicals archive ?
Effects of acute treatment and long-term treatment with MK-801 against amygdaloid kindled seizures in rats.
Vitamin D nuclear binding to neurons of the septal, substnatal and amygdaloid area in the Siberian hamster (Phodopus sungorus) brain.
Amygdalar stimulation promotes glucocorticoid release, whereas large lesions of the amygdaloid complex reduce HPA axis activity (see Herman et al.
The lateral amygdaloid nucleus: Sensory interface of the amygdala in fear conditioning.
There is accumulated evidence that the amygdaloid complex of nuclei such as amygdale, representing the central emotional management within the human brain, gives emotional (affective) tone to the input sensory information even before its conscious processing (Simic and Goran 2009).
In neonatal rat pups, fresh leaf juice of the plant showed enhancement of amygdaloid neuronal dendritic arborization suggesting that it can be used for enhancing neuronal dendrites in stress and other neurodegenerative and memory disorders Mohandas Rao, et al.
Convulsant properties of cyclotrimethylenetrinitramine (RDX): spontaneous audiogenic, and amygdaloid kindled seizure activity.
It appears that one 'automatic', bottom-up, subcortical-amygdaloid pathway mediates non-consciously perceived fear, whereas consciously perceived fear is mediated by both subcorticalamygdaloid and cortical amygdaloid pathways.
340) showed that activity in the amygdaloid region (the area that processes emotions and stores implicit memory) decreased while activity in the medial prefrontal cortex and cingulate sulcus (the areas responsible for cognitively conscious processing) increased during an application of a cognitive intervention in direct response to aversive visual stimuli.
The mesolimbic dopamine system is a grouping of axons that extends from the brain's amygdaloid region to the frontal, prefrontal, and anterior cingulate cortexes that regulate feelings of pleasure.
In observing the activation of the amygdaloid CRF system during abstinence from sweet foods, we understood the causes of recurrent dieting failures," said Cottone.