spine
Spine (noun) means the column of bones running down the back, from the head down to the tail or pelvis, that protects the spinal cord and holds up the chest and abdomen. Example: “The doctor checked my spine to see whether my back was straight.”
Fill the gap
Can you complete this real example?
The doctor checked my _____ to see whether my back was straight.
Etymology
Came from late Middle English spyne, from Old French espine (French épine) or its source, Latin spīna (“a thorn; a prickle, spine; the backbone”). A doublet of spina.