clavi-
I.combining form 
or clavo-
Etymology: Medieval Latin clavi-, from Latin, from clavis key — more at clavicle 
1. : key : keyboard 
< clavichord >
< clavilux >
2.[New Latin clavi-, clavo-, from Latin clavi-]   : clavicle : clavicular : clavicular and 
< clavipectoral >
< clavodeltoid >
II.combining form 
Etymology: New Latin, from Latin, from clava; perhaps akin to Latin clavis 
 : club 
< Clavicornia >
< claviform >
I.
or clavo-
1.
< clavichord >
< clavilux >
2.
< clavipectoral >
< clavodeltoid >
II.
< Clavicornia >
< claviform >