/ik strooh"siv, -ziv/ , adj.
1. tending to extrude.
2. pertaining to extrusion.
3. Also, effusive . Geol. noting or pertaining to a class of igneous rocks that have been forced out in a molten or plastic condition upon the surface of the earth.
[ 1810-20; EXTRUS(ION) + -IVE ]