In a piece of machinery with multiple parts, a part that is not powered to move.

plural of moving part

Part of a machine that is powered to move. / (figuratively, chiefly in the plural) One of the variables or components in a complex situation.

plural of mouth-part

Alternative spelling of mouthpart

plural of spare part

plural of part-timer

plural of parting shot

(idiomatic) A man who is talented in multiple areas of life.

plural of man of parts