Any of a class of fibrous proteins found in pilus structures in bacteria

plural of pilin

A structural support comprising a length of wood, steel, or other construction material. / The act of heaping up.

present participle of pile

plural of piling

A type of retaining wall used during construction by driving interlocking sheets of material into the ground. / The material used to assemble a sheet pile retaining wall.

present participle of pile on

(American football) An illegal strategy wherein players tackle an opposing player.

present participle of pile up

plural of sheet piling