| 单词 | pygo- | 
| 释义 | pygo-comb. form  Of or relating to the posterior or rump of an animal. ΚΠ 1890    Cent. Dict.  				Pygobranchiate, having gills around the anus. ΚΠ 1858    R. G. Mayne Expos. Lexicon Med. Sci. 		(1860)	 1048/1  				Pygobranchius,..applied by Gray to an order (Pygobranchia) of the Gasteropodophora..; pygobranchious.   pygopagous adj.  Brit.  , U.S.   Medicine designating conjoined twins of the pygopagus type.ΘΚΠ the world > health and disease > ill health > deformity > 			[adjective]		 > Siamese twins bicephalous1803 Siamese1833 thoracopagous1894 xiphopagous1894 pygopagous1895 xiphopagic190. 1895    Teratologia 2 274  				Several of the pygopagous twins of whom there are scientific records, survived birth and lived for a number of years. 1902    Brit. Med. Jrnl. 5 Apr. 850  				Pygopagous twins..united together in the region of the nates and having each its own pelvis. 1979    Jrnl. Pediatric Surg. 14 554  				A set of female pygopagous twins was successfully separated.   pygopagus  n.  Brit.  , U.S.  				 [ <  pygo- comb. form + -pagus comb. form, after French pygopage (see pygopage n.); compare earlier pygopage n.]			 Medicine a pair of conjoined twins united in the region of the buttocks (usually at the sacrum and coccyx); either of a pair of such twins.ΘΚΠ the world > health and disease > ill health > deformity > 			[noun]		 > congenital union > Siamese twins Siamese twins1829 pygopage1844 xiphopagus1844 xiphodyme1861 pygopagus1866 thoracopagus1894 1866    Trans. Med. Soc. N.Y. 224 in  Docs. Assembly State N.Y. (89th Session, Doc. No. 133)  				The symmetrical pygopagus is exceedingly rare. 1903    J. W. Williams Obstetr. xxxix. 680  				Ischiopagi and pygopagi, as a rule, call for complicated and difficult manœuvres before delivery can be effected. 1997    Amer. Jrnl. Perinatol. 14 25  				Three pairs of female conjoined twins—a xiphoomphalopagus, a pygopagus, and a thoracopagus—were encountered during the past 10 years. 2004    Child's Nerv. Syst. 20 640  				A pair of pygopagi had back-to-back fusion of the conus.   pygopodine adj.  Brit.  , U.S.  , ΚΠ 1904    Amer. Naturalist 38 13  				Drawings of the bones of pygopodine birds.   pygopodous adj.  Brit.  , U.S.  				 [after scientific Latin Pygopus (see pygopod n.)]			 Zoology (now disused) designating aquatic birds having the legs placed far back on the body, including auks, grebes, and divers (formerly sometimes classified together as a suborder  Pygopodes).ΘΚΠ the world > animals > birds > parts of or bird defined by > 			[adjective]		 > of legs > belonging to group defined by pygopodous1869 homalogonatous1874 pygopod1890 1869    E. Coues in  Proc. Acad. Nat. Sci. Philadelphia 207  				In Pygopodous families the maximum of backward position of the legs and upright position of the body is attained. 1903    Amer. Naturalist 37 63  				It is very likely that Hesperornis used its broad, horizontally flattened tail..as a propeller and rudder to the aquatic locomotion of this ancient pygopodous fowl. This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022). <  | 
	
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