598 ■ GLOSSARY 



Jejunum (jS joo' ntim). The second region of the small mtestine in mammals. 

 Jennings, Herbert S. American zoologist, at Johns Hopkins University; 1868- . 



Kary (kftr' i). G.; a nut; in biology, a nucleus. 



karyokinesis (kSr i 6 ki ne' sis). Mitosis. 



karyosome (kar' \ 6 s5m). A nucleolus composed of chromatin. 



katabolism (ka tab' 6 llz'm). The processes in metabolism concerned with the 



breaking down of protoplasm and with getting rid of waste; adj., katabolic 



(katabSl'Ik). 

 Kelvin (kfil' vin). Baron; William Thomson. Scottish physicist; 1824-1907. 

 keratin (k6r' a tin). A nitrogenous substance forming the chemical basis of horn, 



hair, nails, feathers, and epidermal scales. 

 kidney. The organ of elimination in vertebrates. 

 King, Albert F. A. American physician; 1841-1914. 



Labium (la'bKum). An exoskeletal mass, composed of several pieces, which forms 



the posterior boundary of the mouth in insects; adj., labial, 

 labrum (la' brtim). An exoskeletal mass which forms the anterior boundary of the 



mouth in insects. 

 lachrymal (lak' rl mal). Pertaining to the tears. 

 lact (lakt). L.; milk. 

 lacteal (lak' te al). As a noun, a lymph vessel in the wall of the small intestine mto 



which fats are absorbed; as an adjective, pertaining to milk. 

 Lamarck, de (de la mark'), Jean B. P. A. de M. French zoologist; 1744-1829. 

 lamella (la m&V a). A thin layer or plate; adj., lamellar, 

 larva. The young of an animal which undergoes metamorphosis after it has hatched 



from the egg; usually an active stage characterized by rapid growth; adj., larval, 

 larynx (lar' Inks). In vertebrates the enlarged anterior end of the trachea containing 



the vocal cords; adj., laryngeal (lar In' je al). 

 Laveran (Uiv ran'), Charles L. A. French physician; 1845-1922. 

 Lavoisier (lavwazya'), Antoine L, French chemist; 1743-1794. 

 Leeuwenhoek, van (van la' ven hook), Anton. Dutch naturalist; 1632-1723. 

 lens. A transparent body in the eyes of animals which focuses the rays of Hght; adj., 



lenticular (Ign tic' u lar). 

 leucocyte (lu' ko sit). A white blood corpuscle, 

 ligament (llg' am6nt). A band of fibrous tissue connecting structures in the body 



other than muscles; adj., ligamentous (llg am6n' tiis). 

 Light, Sol F. American zoologist, at the University of Amoy; 1886-. 

 linin (li' nin). The delicate reticulum in the nucleus upon which are the granules of 



chromatin. 

 linkage (link' aj). The constant association of certain genes in particular chro- 

 mosomes. 

 Linnaeus (II ne' tis), Carolus. Swedish naturalist; 1707-1778. 

 lipase (lip' as). A fat-decomposing enzyme. 

 lipoid (lip' oid). Like a fat. 



Loeb (lob), Jacques. German-American biologist; 1859-1924. 

 Lotsy (lot' si), Jan P. Dutch botanist; 1867-1931. 

 lumen (lu' m6n). The cavity in a tubular gland, duct, canal, or vessel, 

 lung. A respiratory organ of the air-breathing vertebrates. 

 lymph (llmf). The blood plasm, together with white corpuscles, in the lymph vessels 



or in the tissues. 

 lymphatic (llm fat' Ik). A vessel conveying lymph; found in vertebrates. As an 



adjective, pertaining to lymph. 



