"Interasteric" is a term that is not commonly found in vocabulary. However, it can be broken down phonetically as /ɪntəræstɛrɪk/. The first syllable "inter" is pronounced as /ɪntər/ and means "between" or "among". The second syllable "aster" is pronounced as /æstɛr/ and refers to a star or a star-shaped structure. The suffix "-ic" indicates that something is related to or characterized by the preceding word. So, "interasteric" can be understood as pertaining to a structure or phenomenon that occurs among or between stars.
Between the two asteria; see asterion.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.