amygdaloid Syllabification: (a·myg·da·loid)Pronunciation: /əˈmigdəˌloid/Definition of amygdaloid adjective technical shaped like an almond. noun 1 (also amygdaloid nucleus) Anatomyanother term for amygdala. 2 Geology volcanic rock with amygdules. Origin: mid 18th century: from Latin amygdala 'almond' + -oidamygdaloid in other Oxford dictionaries Definition of amygdaloid in the British & World English dictionary