1. Of metals e.g.; not made shiny and smooth by friction

See also: unpolished

• spongioblastoma
• spongy
• sponson
• sponsor
• sponsorship
• spontaneity
• spontaneous
• spontaneous abortion
• spontaneous combustion
• spontaneous generation
• spontaneously
• spontaneousness
• spontoon
• spoof
• spook
• spookily
• spooky
• spool
• spooler
• spoon
• spoon bread
• spoon food
• spoon-shaped
• spoonbill
• spoonbill catfish