ˈ ̷ ̷ ̷ ̷ˌlith noun
( -s )
Etymology: phac- + -lith
: a lens-shaped mass of igneous rock intruded in folded sedimentary beds with which it is approximately concordant and having its greatest thickness along the axes of synclines or anticlines
• phac·o·lith·ic | ̷ ̷ ̷ ̷|lithik adjective