834 Appendix 



Glomerulus (glo -mer' u lus) (L. glomero, ball), ball-like mass of capillaries at 

 enlarged end of the kidney tubule of higher vertebrates (same as Mal- 

 pighian body). 



Glottis (glot'is) (Gr. glotta, tongue), slitlike opening in the pharynx leading to 

 windpipe (trachea). 



Glucose (glu' kos) (Gr. glykys) , grape sugar. 



Glycogen (gli'kojen) (Gr. glykys, sweet), a starchlike carbohydrate stored in 

 the liver and other tissues and in certain algae and fungi. 



Goiter (goi' ter) (L. guttur, throat), pathologic enlargement of the thyroid gland. 



Golgi bodies (gol'je) (after Golgi, Italian physician), special bodies in cyto- 

 plasm of certain cells. 



Gonad (gon' ad) (Gr. gonos, reproduction), a male or female sexual reproduc- 

 tive organ. 



Gonidia (go -nid' i a) (Gr. gone, seed), asexual nonmotile reproductive cells. 



Gonophore (gon' o for) (Gr. gonos, seed; phoreo, to bear), gonad-bearing struc- 

 ture. 



Graafian follicle (graf i an; fol' i kl) (after de Graaf, Dutch physician; L. follis, 

 bag), small cavity in the ovary, especially of mammals, in which egg 

 develops. * 



Grafting, transplanting an organ or tissue from one plant or animal to another. 



Grana (gran' a) (L. granum, small grain), small particles of chlorophyll in chloro- 

 plasts. 



Green gland, excretory organ of a crayfish. 



Growth hormone, specific chemical substances in plants and animals (especially 

 higher animals) which influence, regulate, or control growth or other 

 activities. 



Guanin (gwa'nin) (huano, dung), a white substance found in guano (excrement 

 of sea birds) and other animal substances. 



Guard cell, specialized cell of the epidermis of leaves to regulate the size of the 

 stomata of leaves. 



Gullet, see Oesophagus. 



Gustatory (gus' ta to ri) (L. gustare, to taste), sense of taste. 



Guttation (guta'shun) (L. gutta, drop), exudation of water drops from plants 

 (especially leaves) due to internal pressure. 



Gymnosperm (gym' no spurm) (Gr. gymnos, naked, exposed; sperm, seed), a 

 plant whose seeds are not enclosed by carpels (contrast with Angiosperm). 



Gynandromorph ( ji -nan' dro morf) (Gr. gyne, woman; aner, man; morphe, 

 form), an abnormal individual who has male characteristics in one part of 

 its body and female characteristics in another. 



H 



Habitat (hab' i tat) (L. habito, to dwell), usual or natural dwelling place. 



Halteres (hal-te'rez) (Gr. halter, weight used in jumping), pair of capitate 

 bodies used as balancers during flight of insects in the order Diptera. They 

 represent the rudimentary posterior wings of these insects. 



Haploid (hap'loid) (Gr. haplos, single; eidos, form), single or reduced number 

 of chromosomes in mature germ cells (gametes), or the gametophyte gen- 

 eration of plants, in contrast to the diploid number in body cells. 



