You learn what letter your blood type is (A, B, AB, and O). You also learn what your Rhesus, or RH, factor is. Your blood is either RH+, meaning the blood has the RH factor, or RH-, meaning the RH factor is not in your blood.he c, e, and d genes are negative RH genes; meaning there is no RH factor in the blood. Research shows only the âDâ gene causes sensitivity issues, so itâs the D gene that is of concern during your pregnancy. Thatâs why some care providers call the RH factor RH (D) positive or RH (D) negative.
Definition of RETARDATION. 1. : an act or instance of retarding. 2. : the extent to which something is retarded. 3. : a musical suspension; specifically: one that resolves upward. 4. a: an abnormal slowness of thought or action; especially: mental retardation b: slowness in development or progress.
To retard means to slow down, in case of aircraft it has a very clear meaning of Slow down as fast as you can. That some teens only know the word retard from the context of being disabled in intelligence, is not the problem of aircraft designers, but the problem of those teens if they decide to become aerospace engineers one day.