ball-and-socket joint (def 2).
It is obvious that the ball joint between b and c permits the flange a to set at an angle if necessary.
Modern Machine-Shop Practice, Volumes I and II Joshua Rose
another name for ball-and-socket joint
- Ball lightning
a rare form of lightning, consisting of a bright, luminous ball that moves rapidly along objects or floats in the air. Historical Examples Someone, says a ball lightning came down and broke over there. Pursuit Lester del Rey As to what ball lightning is, we have not yet begun to make intelligent guesses. The Book […]
- Ball mill
a grinding mill in which the material to be ground is tumbled in a drum with heavy balls of iron, steel, or stone. Historical Examples In another type of mill, called the ball mill, the principle is different. Marvels of Scientific Invention Thomas W. Corbin noun (engineering) a horizontal cylinder or cone in which a […]
- Ball of fire
a dynamic person capable of or displaying rapid and highly effective thought, action, etc.: The new manager turned out to be a ball of fire. noun (informal) a very lively person noun phrase A dazzling performer; spectacularly successful striver; overachiever; go-getter, hot shot [1900+; perhaps fr earlier ball of fire, ”a very fast train”] A […]
- Ball of foot
ball of foot ball of foot n. The padded portion of the sole of the human foot between the toes and the arch, on which the weight of the body rests when the heel is raised.