Relating to or causing dilation; characterized by expansion or the process of becoming wider or larger.
From dilation + -al (adjective suffix). Dilation comes from Latin dilatatio. The -al suffix converts the noun into an adjective describing properties or characteristics related to dilation.
In seismology, dilatational waves (also called P-waves) are the primary earthquake waves that make rocks expand and contract—they travel fastest and arrive first, giving early warning of quakes.
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