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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 ?
8: CeC - capsular part of central amygdaloid nucleus, CeL - lateral division of central amygdaloid nucleus, and CeM - medial division of central amygdaloid nucleus.
Vitamin D nuclear binding to neurons of the septal, substriatal and amygdaloid area in the siberian hamster (Phodopus sungorus) brain.
Chronic stress induces contrasting patterns of dendritic remodeling in hippocampal and amygdaloid neurons.
DL-tetrahydropalmatine may act through inhibition of amygdaloid release of dopamine to inhibit an epileptic attack in rats.
Pribram also discovered that cells in the amygdaloid complex specifically responded to information from the cardiac cycle.
Wightman, "In vivo voltammetric measurement of evoked extracellular dopamine in the rat basolateral amygdaloid nucleus," The Journal of Physiology, vol.
(-)-[[sup.123]I] OIDV (13) was distributed in characteristically VAChT-rich regions, such as the cortex, striatum, diagonal band, amygdaloid nucleus, and trigeminal and facial nucleus [65,66,77].
Interestingly, central administration of CRH activated neurons in the bed nucleus of the stria terminalis, lateral septum, medial and central amygdaloid nuclei, and PVN in virgin rats, but not in lactating counterparts [62].
Ingram, "Oxytocin-induced excitation of neurones in the rat central and medial amygdaloid nuclei," Neuroscience, vol.
Regulation of neuropathic pain behavior by amygdaloid TRPC4/C5 channels.
2004.Recovery after chronic stress fails to reverse amygdaloid neuronal hypertrophy and enhanced anxiety-like behavior.Neuroscience 128.4 667-673.
Besson, "The organization of the efferent projections from the pontine parabrachial area to the amygdaloid complex: a Phaseolus vulgaris leucoagglutinin (PHA-L) study in the rat, "Journal of Comparative Neurology, vol.