toom a, tom a

[TELEGU.] Bot.: Acacia arabica. toôn (1), s. [TOWN.] ( Scotch.) tion. Man has two sets of teeth, the temporary, deciduous, or milk teeth, and the permanent are twenty in all, Bot.: Cedrela toona. [CEDRELA.] toon-wood, s. [TOON (2).] toôp, tip, s. [TUP, s.] A ram. ( Scotch.) "O, may thou ne'er forgather up Wi' only blast it moorland toop ." Burns: Death of Poor Mailie. toôr, tûr, subst. [Mahratta, ., to or, thûr, thor, Sans. arhuku .] Bot.: Cajanus indicus. ( Anglo - Indian. ) toôr'-co-măn, s. [TURKOMAN.] toô-roô, s. [Native name.] Botany : Enocarpus batawa , a South American palm. The Indians make arrows for their blow pipes from the stiff, slender nerves of the base of the decaying leafstalk. IMG:content-1218.jpg:[blocks in formation] viz., ten in each jaw; and the permanent ones are thirty-two, viz., sixteen in each jaw. The temporary teeth in each jaw consist of: Incisors 4; Canines 11; Molars 2-2; the permanent teeth of Incisors 4; Canines 1-1; Premolars 22; Molars 3-3. Of the deciduous teeth, the central incisors appear from the sixth to the eighth month; the lateral incisors from the seventh to the tenth; the first molar from the twelfth IMG:content-1219.png:[subsumed][ocr errors][subsumed][merged small][subsumed] Showing the teeth of a child at six years old. All the deciduous teeth are shown, and the first permanent molar in each jaw ( m 1) has been cut; the incisors (11, 12), canines (c), premolars ( pm 1, pm 2), and second molar ( m2 ) are shown in the alveoli of the jaw. to the fourteenth, the canines from the fifteenth to the twentieth, and the second molar from the twentieth to the thirtieth. The first permanent molar appears at the age of six, the central incisors at seven, the lateral incisors at eight, the anterior premolars at nine, posterior ones at ten, the canines at eleven or twelve, second molars at twelve to thirteen; the third, or wisdom-teeth, at seventeen to twenty-five. The roots of the teeth are implanted in the alveoli of the jaws, which they fit accurately. The teeth of the upper jaw slightly overhang those of the lower. A tooth consists of three portions, viz., a crown, a root, with a fang or fangs, and a neck. On making a section of a tooth, the hard substance of which it is composed is hollow within. The cavity is called the pulp cavity, as it is filled by a soft, highly vascular, and sensitive substance called the dental pulp. The hard part of a tooth is composed of three substances-ivory or dentine, enamel, and a cement, or crusta petrosa . A tooth is formed in the same way as a hair. Among the lower vertebrates the teeth are so varied in number and character, and these variations are so correlated with other parts of the structure, that they are of primary value for the purpose of cla ification. For details, see the various orders (as Carnivora, Rodent i a, Ruminant i a, .). Recent birds have no teeth properly so called [ODONTORNIS], but the name is applied to a notch in the bill of the more predatory species. It is large and conspicuous among the birds of prey, and one of the tribes of Perchers is called Den tiros tres. In reptilia the character of the teeth, and especially the fact whether or not any of them constitute poison fangs, is of great importance. Among the Amphibia and fishes the teeth greatly vary, but the differences are not so important for the purpose of cla ification as in the mammals. Among invertebrates, the word tooth is often employed for a notch in some organ or other; but in this case it is not homologous to the teeth of the vertebrates. 2. Bot . ( pl .): Projections separated by indentations on the margin of a leaf, and resembling serrations, but with concave instead of straight edges. (1) In spite (or despite ) of one's teeth : In open or direct defiance of; in opposition to every effort. *(2) In the teeth : In direct opposition; directly in front. "Dost thou jeer, and flout me in the teeth?" Shakesp.: Comedy of Errors, ii. 2. (3) To cast (or throw ) anything in one's teeth : To taunt or reproach one with anything; to retort reproachfully. "The thieves also, which were crucified with him, cast the same in his teeth ."- Matt . xxvii. 44. (4) To one's teeth : To one's face; in open opposition; openly. "It warms the very sickne in my heart, That I shall live and tell him to his teeth, Thus didest thou." Shakesp.: Hamlet, iv. 7. IMG:content-1220.png:[blocks in formation] IMG:content-1221.png:[graphic] Ornith.: Didunculus str i giro str is , from Navigator's Island. It is about fourteen inches long, body rounded, beak orange, nearly as long as the head, greatly arched on the upper mandible, the lower mandible deeply cleft into three distinct teeth near the tip. Head, neck, breast, and abdomen glo y greenish black, velvety black on shoulders and upper part of back; rest of back, wings, tail, and under coverts deep chestnut. Called also the Little Dodo. [DIDUNCULUS.]