TECTIFORM 



1460 



TEGMENTUM 



20 in number, are called milk, temporary, or deciduous 

 teeth. In the adult the permanent teeth consist of 2 



Incisors. 



Canine. 



Bicuspids. 



Molars. Wisdom-tooth. 



and branches used as dyes. T. subvernicosa, of S. 

 America, is diuretic ; others are actively astringent. 



Tectiform (tek'tiform) {tec- 

 tum, a roof; forma, form]. 

 In biology, like a roof or lid. 



Tectocephalic (tek-to-sef-al'- 

 ik) [tectum, a cover; Ke^taTJ), 

 head]. Pertaining to a roof- 

 shaped skull. 



Tectochrysin (tek-to-kris'-in) 

 [tektuv, a carpenter ; jpi'troc, 

 gold]. A coloring-matter ob- 

 tained from Poplar Buds. 



Tectology (tek-tol' '-o-je) [rkn- 

 ruv, a builder; Aoyoc, science]. 

 In biology, structural morph- 

 ology. 



Tectona (tek-to'-nah) [reKTOjvia, 

 carpentery]. Teak, a tree of 

 the natural order Verbenacea, 

 the East Indian oak. Its 

 wood is valuable for ship- 

 building. Its leaves are astrin- 

 gent and the flowers and 

 seeds diuretic. 



Tectorium (tek-to' '-re-um) [te- 

 gere, to cover : //. , Tectoria]. 

 In biology, a covering, as the The Teeth of an Adult. 



coverts of a bird ; also applied The upper section of the illustration represents the upper set, and the lower the lower set. 

 to the membrane of Corti. 



Tectorial (tek-to'-re-al) [tectorium, a cover]. Serving 

 as a tectorium, or covering. T. Membrane. See 

 Membrane of Corti. 



Tectrices ( tek'- 

 tris-ez) \jegere, 

 cover, conceal]. 

 Plural of Tec- 

 trix. In biol- 

 ogy, the feath- 

 ers of the wing- 

 coverts or tail- 

 coverts of a 

 bird, as distin- 

 guished from 

 rem ig e s, and 

 rectrices. 



Tectrix (tek f - 

 triks) [L., a 

 cover : //. , Tec- 

 trices] . Cover- 

 ing or hiding. 

 Tectrices, the 

 plural, applies 

 to the smaller 

 feathers that 

 cover the quill- 

 feathers, wings, 

 or tail of a 

 bird. 



Tedium vitae 

 (te'-de-um vi'- 

 te). See Te- 

 dium. 



Teeth (telh)[P\u 



...RM. 



Tooth in the 



Vertical Section of 



Jaw. 



ral of tooth, q. E. Enamel D. Dentine. P. M. Perio- 



V.\ In man, dontal membrane. P. C. Pulp-cavity. 



thehirrl bodies Cl Cement - B - Bo »e of the Lower 

 Ui. .nam DOOiei Jaw y Vejn a Artery. N. Nerve. 



which occupy (Front Stirling.) 



the alveolar 



cavities of the upper and lower jaws. They are the 



hardest portions of the body and the principal organs 



of mastication. The first set of teeth in childhood, 



incisors, I cuspid or canine, 2 premolars or bicuspids, 

 and 3 molars in each lateral half of each jaw. The 

 last molar of each half-jaw is cut at an age of from 20- 

 25 years, and is therefore called a ■wisdom-tooth. In 

 popular parlance the upper canine teeth are called 

 eye-teeth; the lower canines, stomach-teeth. The upper 

 central incisors are sometimes called butter-teeth \\> 

 structure the tooth consists of a hard enamel, em 

 the crown; the dentine, within the enamel, c 

 tuting the whole of the root and interior of tin 

 crown ; and the pulp, a bulbous prolongation of 

 the mucosa of the gums, which is traversed by blood-! 

 vessels and nerve-filaments. The dentine of the: 

 root is surrounded by the cement or crusta / 

 The exposed part of the tooth is the crown, the 

 middle part the neck, and the part within the alveoli 

 the fang or root. T., Auditory, the tooth-like 

 jections on the edge of the limbus laminae spiralis ol 

 the ear. They extend between the epithelial 

 and give the limbus an uneven, highly refracting 

 face. They are composed of the osteogenous tissiu 

 of the crista. T., Numbering of the, in nui 

 ing the teeth, the incisor next the symphysis mend 01 

 meson is first, the wisdom-tooth last, or eighth. Tin 

 first incisor is also said to be central, mesi 

 proximal, and the last or wisdom-tooth, distal. It 

 numbering the groups of teeth, as incisors, bicuspid;! 

 or premolars, molars, the one nearest the symphysis i 

 number one of the particular group. T., Temporary: 

 the teeth of the first dentition ; milk-teeth ; deci 

 teeth ; also, a provisional set of artificial teeth. 



Teething (te'-thing) [ME., teethe, to cut the teeth] 

 The development and appearance of the firs! \< 

 an infant. Dentition. 



Teetotalism (te-to' -tal-izni) [redup. of total]. 

 practice of entire abstinence from alcoholic bev< 



Tegmen (teg'-men) [legmen, a cover: //., Teg) 

 In biology, a covering, as the coat of 

 coverts of a bird, or the elytrum of a beetle. T. tym 

 pani, the roof of the tympanic cavity. 



Tegmentum (leg-men' -turn) [fegere, to cover]. \ 

 ering. The dorsal portion of the cms cerebri, forme 



