The story
- Late Latin · borrowed fromspīnālis“of or belonging to the spine”
- English todayspinal
Borrowed from Late Latin spīnālis (“of or belonging to the spine”), from spīna (“a prickle, spine”) + -ālis (“-al”, adjectival suffix). By surface analysis, spine + -al.
Etymology from Wiktionary, CC BY-SA 4.0.