Definition of "plasticine"

Models; how to make paper pulp models; salt and flour models; sand models; plasticine models; chalk and pencil models.

1909, William James Sutherland, The Teaching of Geography‎

Hermione Roddice suggested we should ask Gudrun to teach her to draw and to model in clay. You know Winnie is astonishingly clever with that plasticine stuff. Hermione declares she is an artist.

1920, D. H. Lawrence, Women in Love

Picture yourself on a train in a station / With plasticine porters with looking glass ties

1967, Lennon–McCartney (lyrics and music), “Lucy in the Sky with Diamonds”, in Sgt. Pepper’s Lonely Hearts Club Band, performed by The Beatles