DEN 



D E R 



commonly by the name of tooth-shells, 

 or sea teeth. Twenty-two species have 

 been described, seven of which inhabit 

 our coasts. 



DE'NTALITE.' } (from dens, a tooth, and 



DE'NTALITHE. $ \iQoQ, a stone.) A fossil 

 dentalium found in the tertiary formations, 

 in the gait and in the lower green sand. 

 Of these there are many species ; as the 

 Dentalium planum, D. striatum, D. ellip- 

 ticum, D. decussatum, &c. 



DENTA'TA. A name given to the second 

 vertebra of the spinal column, from a 

 tooth-like process which it possesses. 



DE'NTATE. > (dentatus, Lat.) Indented; 



DE'NTATED. 5 jagged ; notched ; toothed. 

 In botany, leaves are called dentated, 

 when the border is beset with horizontal 

 projecting points or teeth, with rather a 

 distant space between each, and of the 

 same consistence as the substance of the 

 leaf itself: applied also to stipules hav- 

 ing spreading teeth about the margin, 

 remote from each other. 



DE'NTED. (dente, Fr. decoupt en point es 

 serr6es les unes contre les autres.) 

 Notched; indented. 



DE'NTILE. A small tooth, as that of a 

 saw : a term used in conchology. 



DENTI'CULATED. (denticulatus, Lat.) Set 

 with small teeth, as in the area. 



DENTICULA'TION. The state of being set 

 with small teeth. 



DE'NTIFORM. (from dens and forma, Lat.) 

 Tooth-shaped. 



DENTI'TION. (dentition, Fr.) The period 

 at which the teeth are being formed within 

 the jaws, and protruded through the 

 gums. 



DE'NTOID. (from dens and tldog, Gr.) Of 

 the shape, or form, of a tooth. 



DE'NUDATE. (denudo, Lat.) To lay bare ; 

 to strip ; to divest of its covering. 



DENUDA'TION. (denudatio, Lat. denuda- 

 tion, Fr.) The laying bare ; the act of 

 divesting of its covering ; the uncovering 

 of strata by the washing away of their 

 covering. 



DENU'DE. (denudo, Lat. dtnuer, Fr. de- 

 nudare, It.) To lay bare ; to divest of 

 its covering ; to strip. 



DENU'DED. Laid bare ; exposed ; divested 

 of its covering ; stripped. 



DEOBSTRU'CT. (from deobstruo, Lat.) To 

 free from impediments. 



DEO'XYDATE. ) To reduce from the state of 



DEO'XYDIZE. 5 an oxyd by depriving it 

 of its oxygen. 



DEO'XIDIZED. "I Deprived of oxygen ; dis- 



DEO'XYDIZED. { united, or separated 



DEO'XIDATED. f from the oxygen with 



DEO'XYDATED. J which it was previously 

 joined. 



DE'PILATE. (depilo, Lat. depiler, Fr. 

 depilare, It. ) To deprive of hair. 



DE'PILOUS. (from de and pilus, Lat.) 

 Having no hair. 



DEPLUMA'TION. (deplumatio, Lat.) The 

 plucking off the feathers. 



DEPLU'ME. (dtplumer, Fr.) To pluck, or 

 strip, of its feathers. 



DEPLU'MED. (deplume, Fr.) Stripped of 

 its feathers. 



DEPO'SIT. Matter laid or thrown down ; 

 that which having been suspended or 

 carried along in a medium lighter than 

 itself at length subsides, as mud, gravel, 

 stones, detritus, organic remains, &c. 



DEPOSITION. That which is deposited or 

 thrown down. 



DEPRE'SSED. (depressus, Lat.) Pressed 

 down ; low ; shallow ; flat. In botany, 

 leaves are called depressed when flattened 

 vertically : radical leaves are thus called 

 when they are pressed close to the ground. 



DEPRESSION, (depressio, Lat. depression, 

 Fr. depressione, It.) The sinking, or 

 falling in, of a surface. 



DEPRE'SSOR. The name given to such 

 muscles as have the power of depressing, 

 as the depressor anguli oris, &c. 



DE'PURATE. > (dtpurer, Fr. rendre plus 



DEPU'RE. $ pur: depurare, It.) To 

 free from impurities ; to cleanse. 



DE'PURATE. \ (dtpurt, Fr.) Cleansed; 



DE'PURATED. $ freed from impurities. 



DEPURATION. (depuration, Fr. depura- 

 zione, It. depuratio, Lat.) The action 

 of freeing from impurities, of cleansing. 



DERA'CINATE. (de'raciner, Fr. tirer de 

 terre, arracher de terre un arbre.) To 

 tear up by the roots ; to extirpate. 



DERACINATING. Tearing up by the roots ; 

 violently extirpating. 



DERBYSHIRE SPAR. This beautiful sub- 

 stance is fluate of lime, a combination of 

 calcareous earth with fluoric acid ; it oc- 

 curs in nodular masses, and in crystals. 

 It is found in great beauty and abun- 

 dance in Derbyshire, whence it has ob- 

 tained its name, but it is also plentiful in 

 other parts of England. It is also called 

 flour-spar and blue-John, which latter 

 see. 



DERIVA'TION. (derivatio, Lat. derivation, 

 Fr. detour qu 1 on fait prendre aux eaux.} 

 The turning of water from its usual 

 course ; the drawing off of water from its 

 regular channel. 



DERI'VE. (from derivo, Lat. dMver, Fr.) 

 To turn the current of water from its 

 course. 



DE'RMAL. (from dep/ja, Gr. ) Belonging 

 to the skin ; composed of skin. Thus 

 we read of the dermal fringe of the 

 iguana ; the dermal bones of the hylseo 

 saurus. 



DE'RMA. ) (depict, Gr.) The true skin, 



DE'RMIS. $ as distinguished from the 

 cuticle, epidermis, or scarf-skin. 



