(now historical) Designating a proposed type of marriage (or other partnership) in which the partners plan to have no children and take on no legal obligations to one another. / Friendly, companion...

(anatomy) Between the ribs of an animal or person. / (nautical) Between the ribs of a boat.

simple past tense and past participle of firewall

The appearance of ripples or bumps on a dirt or gravel road, caused by wear from traffic, erosion, or poor grading.