568 GLOSSARY 



habitat (hab' I tat). The area in which a species of animal or a group of animals 

 lives. 



Haeckel (hek' el), Ernst H. German biologist; 1834r-1919. 



haplo (hftp' 16). G.; simple. 



haploid (hftp' loid). The reduced number of chromosomes. 



Harvey, William. English anatomist and physician; 1578-1657. 



head. An anterior region of the body containing the dominant part of the nervous 

 system and the chief sense organs. 



Helmholtz, von, Hermann L. F. German physicist; 1821-1894. 



hem, haem (hem). G.; blood. 



hemi- (hgm'l). G.; half. 



hemocoel (he' mo sel). Coelom-like spaces devoted to the circulation of the blood. 



hemoglobin (he mo glo' bin). A protein found in the blood which by combining with 

 oxygen increases the amount of the gas which can be distributed over the body. 



hemolysis (he mSl' I sis). Solution of the red blood corpuscles. 



hepatic (he pSt' Ik). Pertaining to the liver. 



herbivorous (her blv' 6 rtis). Plant-eating; a plant-eating animal is known as a 

 herbivore (hur'blvor). 



hermaphrodite (her maf ro dit). An animal containing both male and female 

 gonads; adj., hermaphroditic (her maf ro dIt' Ik). 



Herodotus (he r6d' 6 tus). Greek historian; 484?-425 b. c. 



hetero (hff er 6). G.; other, different. 



heteronomous (h6t er 6n' 6 mils) metamerism. A type of metamerism involving 

 unlike metameres. 



heterosis (h6t er 5' sis). Increased vigor due to hybridity. 



heterozygote (h6t er 6 zl' got). An organism in which two corresponding genes or 

 characters are unlike; adj., heterozygous. 



hibernation (hi bur na' shun). Dormancy during winter. 



Hippocrates (hi p6k' ra tez). Greek physician; 460-377 b. c. 



holo (hsr 6). G.; whole. 



holoblastic (h6l 6 bias' tik). A term applied to egg cells possessing total cleavage, 

 involving the whole cell. 



holophytic (h6l 6 fit' Ik). Plantlike as to type of nutrition, involving the utilization of 

 inorganic substances and the carrying on of photosynthesis. 



holozoic (h6l 6 z6' Ik). Animal-like as to type of nutrition, involving the ingestion 

 of organic food. 



hom (hom). G.; the same. 



homolecithal (ho mo 16s' I thai). A term applied to an egg cell with the yolk uni- 

 formly distributed. 



homology (homQl'ojI). Structural similarity due to common origin, both evolu- 

 tionary and embryonic; adj., homologous (ho mol' 6 gfts). 



homonomous (ho mQn' 6 mus) metamerism. A type of metamerism involving like 

 metameres. 



homozygote (h5 mo zl' got). An organism in which the corresponding genes or 

 characters are alike; adj., homozygous. 



Hooke, Robert. English mathematician and microscopist; 1635-1703. 



hormone (hor'mon). An internal secretion which, carried by the blood from the 

 organ which produces it, influences other organs or growth processes. 



host. An organism that harbors a parasite. 



Huxley, Thomas H. English biologist; 1825-1895. 



hybrid (hi' brid). The offspring of parents differing in species or in genetic con- 

 stitution; the production of such is hybridization, 

 hydr (hi'd'r). G.; water. 



