GLOSSARY OF IMPORTANT TERMS 



685 



causes an organism or some part to 



react when affected by it. 

 Stipule (stip'ul) : a leamke outgrowth 



at the base of the petiole. 

 Stoma (sto'md) (pi. Stomata) : a 



breathing hole in a leaf. 

 Stomach (stum'&k): a sac-like part 



of the food tube between gullet and 



intestine. 

 Streptococci (strep'to kok'si) : spheri- 

 cal bacteria in the form of chains. 

 Sweat glands : excretory glands in the 



skin. 

 Swimmeret (swim'er et) : one of the 



paired appendages on the abdomen 



of crustaceans. 

 Symbiosis (sim'bi 6'sis) : a condition 



in which two organisms of different 



kinds live together in a mutually 



beneficial partnership. 

 Synapse (si'naps) : point of junction 



between two neurons. 



Tactile corpuscle : sense organ of 

 touch. 



Tarsus (tar'sws) : the ankle bones ; 

 also the last region of the leg of an 

 insect. 



Taste bud : end organ of taste found 

 on the tongue. 



Teeth : limy structures in the mouth 

 of man and other animals, consist- 

 ing of incisors or cutting teeth ; 

 canines, tearing teeth ; and molars 

 and premolars, crushing and grind- 

 ing teeth. 



Tendon (ten'dwn) : a band of con- 

 nective tissue attaching muscle to 

 muscle or muscle to bone. 



Tentacle (ten'td k'l) : a flexible or- 

 gan at the anterior end of an 

 animal used for feeling, grasping, 

 etc. 



Testa (tes'td) : the thick outer coat of 



Testes (tSs'tez) : sperm-producing 



glands. 

 Thallophyta (thd lof'i td) : phylum of 



plants which do not have roots, 



stems, or leaves. 

 Thoracic (tho ras'Ik) : pertaining to 



the chest region. 

 Thorax (tho'raks) : the part of the 



body between the head and the 



abdomen. 



Thyroid (thl'roid) : large endocrine 

 gland below the pharynx. 



Tissue : a collection of cells all more 

 or less alike and having the same 

 function. 



Tourniquet (toor'ni ket) : a device for 

 arresting bleeding. 



Toxins (tok'sinz) : poisons produced 

 by bacteria. 



Trachea (tra'ke d) : the windpipe ; 

 also a respiratory tube of insects. 



Transpiration (tran'spi ra'sh&n) : the 

 giving off of water vapor from 

 plants. 



Trichina (tri kl'nd) : pork worm, a 

 parasitic roundworm causing the 

 condition called trichinosis. 



Tropism (tro'piz'm) : a definite re- 

 sponse of an organism to one of the 

 forces in its environment. 



Trypanosome (trip'd no som') : pro- 

 tozoan which causes a disease such 

 as sleeping sickness. 



Tympanum (tim'pd num.) : the ear- 

 drum. 



Urea (u're d) : a nitrogenous waste 

 excreted in the urine. 



Vaccination (vak'si na'shun) : inocu- 

 lation with a vaccine, containing 

 living or dead microorganisms or 

 their toxins, in order to protect the 

 body from disease. 



Vaccine (vak'sm) : a substance made 

 from living or dead organisms, 

 which, when inoculated into the 

 body, protects it against a specific 



Vacuole (vak'u ol) : a space in proto- 

 plasm containing air, water, sap, or 

 food material. 



Variation (va/ri a'shwn) : in biology, 

 the occurrence of differences be- 

 tween individuals of the same 

 species. 



Vein : a tube which conveys blood to 

 the heart. 



Venae cavae (ve'ne ka've) : vessels 

 through which the blood returns to 

 the right auricle of the heart. 



Ventilation (ven'tt la'shftn) : changing 

 of air in a room or building. 



Ventral (ven'trdl) : the opposite of 

 dorsal. 



