Neoplasm: a tumour, a new growth of tissue which serves no function in the body. Neoplasms can be benign (not cancer) or malignant (cancer).

The word results from the combination of the Greek neo-, meaning “new” (as in “neonatal”, or “newly born”), and -plasma, “something moulded or created” (as in “plastic”). The phenomenon by which a tumour arises is known as “neoplasia”. The adjective is “neoplastic”, which makes it sound like the material smart phones are made of.