See Also:

rad(6) (iou) and at-(4) (iou)


rad(6) (iou)



rad noun3. [rad] Pl. same, -s. E20.
[from radiation absorbed dose.]
Physics. A unit of absorbed dose of ionizing radiation, corresponding to the absorption of 0.01 joule of energy per kilogram of irradiated material, equivalent to 0.01 gray.

at-(4) (iou)



at- prefix (not productive).
Assim. form of Latin AD- before t. In Old French, Latin att- was reduced to at-, which appears in Middle English adoptions, but in later French, and even more commonly in English, att- was restored by Latinization, as attainder (cf. French atteindre), attorney (French atourne), etc.