Rhn.1
/ˌɑːrˈeɪtʃ/, U.S. /ˌɑrˈeɪtʃ/ Chemistry.
The element rhodium.
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the world > matter > chemistry > elements and compounds > metals > specific elements > rhodium > [noun]
rhodium1804
Rh1814
1814 tr. J. J. Berzelius in Ann. Philos. 3 255 Now the same thing appears to hold with rhodium. The oxides Rh + O, Rh + 3O, form salts with acids.
1928 Proc. Royal Soc. A. 121 147 The results obtained with a wire of platinum-rhodium (10 per cent. Rh, 90 per cent. Pt) were generally similar to those obtained with platinum.
1992 Organometallics 11 48/2 For the same system but different metal the rates of reaction decrease in the order Rh > Re > Mn.
This is a new entry (OED Third Edition, June 2010; most recently modified version published online March 2022).
Rhn.2
/ˌɑːrˈeɪtʃ/, U.S. /ˌɑrˈeɪtʃ/ Medicine.
Used attributively with reference to a major human blood group system originally identified by means of rabbit antisera to rhesus monkey blood, consisting of three principal antigens (one major, D, and two minor, C and E). See rhesus n. 2.
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the world > life > the body > vascular system > blood > [noun] > blood group > specific
B1921
A1923
O1926
Rh1940
rhesus factor1941
1940 K. Landsteiner & A. S. Wiener in Proc. Soc. Exper. Biol. & Med. 43 223 The capacity possessed by some rabbit immune sera produced with blood of Rhesus monkeys, of reacting with human bloods that contain the agglutinogen M has been reported previously. Subsequently it has been found that another individual property of human blood (which may be designated as Rh) can be detected by certain of these sera.
1941 Science 17 Oct. 371/2 Rh positive.
1958 L. P. Strean Birth of Normal Babies iv. 60 If the fetus is Rh-positive and the mother is Rh-negative, then the mother is actually immunized by the developing child's blood.
1968 R. Passmore & J. S. Robson Compan. Med. Stud. I. xxvi. 19/2 Only the ABO and Rh blood group systems contribute significantly to isoantibody incompatibility in the giving of blood transfusions.
1995 J. Shreeve Neandertal Enigma (1996) iii. 59 Rh negative blood is found almost exclusively among Europeans and is most prevalent in the Basque people of the western Pyrenees.
This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).
> as lemmas
RH
RH n. (also rh) relative humidity.
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1918 New Phytologist 17 210 The relative humidity of the air had an affect on the results, so that the R.H. was determined at the time of each set of observations.
1991 Constr. Weekly Products Suppl. Sept. 35/4 A new humidity probe..allows the equilibrium relative humidity (rh) of concrete to be accurately measured at depth.
2001 S. Roaf et al. Ecohouse (2002) i. 29 This demonstrates the excellent ability of the earth walls to control the RH in a space, in a ‘breathing wall’.
RH
RH n. Royal Highness(es); cf. H.R.H. n. at H n. Initialisms.
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1654 E. Nicholas Let. 16 Jan. in Papers (1892) II. 48 Beseech her R.H. that nothing that comes from me may in any kinde be taken notice.
1773 J. Reynolds Let. 20 July in Burlington Mag. (1987) Nov. 733/2 This person..asked his R.H. if he did not know how to buckle a shoe.
1864 Notes & Queries 5 522/1 These are the paternal arms of his R.H. Prince Albert.
1960 Musical Times 101 401/2 The organ was used for the first time..in the presence of their R.H. the Duke and Duchess of Gloucester.
2004 Bucks Winslow Advertiser (Nexis) 11 Nov. RH The Princess Royal opened a new £10million production facility at the Chaucer Industrial Estate.
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