from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Resembling gabbro.
from The Century Dictionary and Cyclopedia
- In petrography, resembling or somewhat like gabbro; also suggested by Chamberlin and Salisbury (1904) as a general term applicable to any crystalline rock in which the ferromagnesian minerals predominate: thus, many diorites, gabbros, and dolerites, and all peridotites would be gabbroids.
gabbro + -oid (Wiktionary)