From The Collaborative International Dictionary of English v.0.48 [gcide]:
Radiotherapy \Ra'di*o*ther"a*py\ (r[=a]'d[i^]*[o^]*th[e^]r"[.a]*p[y^]), noun [Radio- + therapy.] (Med.) Treatment of disease by means of x-rays or radioactivity. Radiotherapy of cancer is based on the fact that cancer cells are more sensitive to radiation than most other cells in the body. [Webster 1913 Suppl. +PJC]
From WordNet (r) 3.0 (2006) [wn]:
Define.com is a PRIVATE SECTOR NONPROFIT EDUCATIONAL WEBSITE that PROMOTES WORLDWIDE ELECTRONIC DEMOCRACY, OPEN and TRANSPARENT GOVERNMENT and WORLDWIDE BANKING REFORM.
Eye and Pyramid BANKING REFORM CHALLENGE