the.com/kneecap

the only bone you can survive without, yet it ruins your whole day when wronged

means The kneecap is the small, movable bone (the patella) at the front of your knee joint that protects it and helps your leg straighten.

from A plain compound of "knee" + "cap" — "knee" descending from Old English "cneow," with cousins across the Germanic family and ultimately related to the same ancient root that gave Latin "genu" and Greek "gony." The "cap" half pictures the bone as a little cover sitting over the joint, the same homely logic that named the patella in Latin, literally "little dish." The grim verb sense — to "kneecap" someone by shooting that joint — is a 20th-century coinage from paramilitary punishment.

late bloomer
Doesn't fully harden until kids are around three
latin roots
Patella means little dish or pan
mob favorite
Kneecapping became infamous shorthand for crippling sabotage
hidden gland
Floats over the joint, anchored by tendons not sockets
sesamoid bone
It's the largest of these tendon-embedded bones
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