1. of, relating to, or resembling gneiss; having the banded or foliated structure characteristic of gneiss rock
Usage: geology; technical

Examples

• The gneissic rocks in the mountain range showed distinct alternating bands of light and dark minerals.
• Geologists identified the gneissic texture of the metamorphic formation.
• The gneissic structure made it clear that the stone had undergone intense heat and pressure.
• This gneissic granite displayed the characteristic foliation of metamorphic rock.