Know how to use "fewer" and "less"? Find out.
1880, from French, literally "self-locking," from auto- "self" (see auto-) + Latin clavis "key" (see slot (n.2)).
autoclave au·to·clave (ô'tō-klāv')n. A pressurized, steam-heated vessel used for sterilization. v. au·to·claved, au·to·clav·ing, au·to·claves To treat in an autoclave.