570 GLOSSARY 



Jejunum (je joo' niim). The second region of the small intestine in mammals. 

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



Kary (kfir' I). G.; a nut; in biology, a nucleus. 



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



karyosome (ka,r' i 6 som). 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 



(kat ab6l'lk). 

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

 keratin (kfir'atln). 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' h\ lim). An exoskeletal mass, composed of several pieces, which forms 



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

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



mouth in insects. 

 lachrymal (lak' rimal). 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 into 



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 mgl' 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 (lav ran'), Charles L. A. French physician; 1845-1922. 

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

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

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



lenticular (l6n tic' u lar). 

 leucocyte (lii' ko sit). A white blood corpuscle. 

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



other than muscles; adj., ligamentous (llg a m6n' ttis). 

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

 linin (ll' 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 (line' tts), Carolus. Swedish naturalist; 1707-1778. 

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

 lipoid (lip' old). 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. 

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

 adjective, pertaining to lymph. 



