TEN 



70S 



TER 



fastening two piecw of tinker tojret her 

 The term is tiom French tenir, or Lut. 

 tmeo, to hold. 



TE'NOR, Ital. tenore. A term in music, 

 imply iug the natural pitch or tenor of a 

 person's voice in singing. 



TEXSE, corrupted from Fr. temps, from 

 Lat. tempus, time. In grammar, time, a 

 particular form of a verb, or a combina- 

 tion of words, used to express the time of 

 action, or of that which is affirmed. The 

 primary or simple tenses are three, past, 

 present, and future; but these admit of 

 modifications which differ in different lan- 

 guages. 



TEN'SJOJJ BRIDGE. Another name for a 

 bowstring bridge. 



TEN'SOR. In anatnmy, a muscle, the 

 office of which is to extend the part to 

 which it is fixed. 



TEN'TACLES, ) Feelers. The exploring 



TEN'TACULA. ) organs of various ani- 

 mals. The term was originally applied 

 to those organs or appendages of the 

 mouth which have no articulation, but 

 it is now_ understood as applicable to 

 organs in its vicinity, used as precursors 

 or feelers and antennae. The tentacula 

 are only motive organs of the fixed poly- 

 pi, as in the cephalopods ; they are used as 

 arms for prehension, as legs for locomo- 

 tion, as sails for wafting their possessors 

 over the boundless deep, as oars for pass- 

 ing through its waves, as a rudder for 

 directing their course, and as an anchor 

 for fixing themselves. 



TENTER. 1. A hook for stretching cloth 



on a frame. 2. In factories, a manager 



of the works of a floor or panic alar de- 

 partment. 



TENTH. In music, the octave of the 

 third, comprehending ten sounds diatoni- 

 cally divided. 



TEN'THREDO. The saw-fly. A very ex- 

 tensive genus of hymenopterous insects 

 belonging to the family Securifera, Cuv. 

 Earned from the serrated ovipositor of 

 the female. The larvae live on the leaves 

 of the plants on which they feed. 



TENTHS. The tenth part of the yearly 

 value of all benefices, which was anciently 

 paid, with the first fruits, to the pope. 



TESTO'RICM. In anatomy, a process of 

 the dura mater, separating the cerebrum 

 from the cerebellum. 



TENUIROS'TRES. A family of passerine 

 birds comprising those which have a long 

 slender beak, whence the name, from te- 

 nnis, slender, and rostrum, a beak. 



TE'NCRE, from tetieo, to hold ; a holding. 

 All the species of ancient tenures may be 

 reduced to four; (1.) Tenure by knight 

 service, which was reckoned the most 

 honourable ; (2.) Tenure in socage, which 

 was either free and honourable, or 

 villain and base ; (3.) Tenure by copy or 

 court-roll, or copvhold tenure, (4.) Te- 



nure in ancient domain. The tenure of 

 free and common socage has now in, 

 great measure absorbed the others. 



TEREBEL'LA. A genus of annulata be- 

 longing to the order Tubicola, Cuv. These 

 animals are found in shallow water on 

 the coasts. They inhabit artificial tube 

 composed of grains of sand and frag- 

 ments of shells. Name from terebellum. 

 dim. of tercbra. 



TEHEBEL'LUM. The name of an oblong 

 shell with a narrow aperture, without 

 plicae or wrinkles, and increasing regu- 

 larly in width to the end opposite the 

 spire ; hence the name terebellum, a little 

 auger. The animal is unknown. Cuvicr 

 places the genus in the class Gasteropoda ; 

 order Pectinibranchiata ; family Biicci- 

 noida. 



TER'EBRA, Lat. from -rt^iu, to bore. 1. 

 In surgery, a trepan or trephine ; also an 



instrument called a perforator. 2. In 



conchology, a* genus of turreted marine 

 univalve shells. Two species are found 

 fossil in the environs of Paris. 



TEREBRAN'CHIA, Lat. terebro, I bore. A 

 section of hymenopterous insects, pro- 

 vided with an anal instrument for making 

 perforations. 



TEREBRAT'ULA. The name given by 

 Bruguieres to a genus of Brachiopoda. 

 The shell is bivalvular ; the valves are 

 unequal and united by a hinge ; the sum 

 mil of the one is more salient than the 

 other, and perforated to permit the pas- 

 sage of a fleshy pedicle, which attache* 

 the shells to rocks, madrepores, other 

 shells, &c. Hence the name from terebra- 

 tus, pierced. Many terebratulae are found 

 fossil. 



TERE'DO. A genus of testaceous ace- 

 phala, belonging to the family Indusa, 

 Cuv., and Tnbicolaria, Lin. Name teredo, 

 a worm which perforates wood : Tigr,3uv, 

 from TI^M, to bore; and the species'when 

 quite young penetrate and establish their 

 habitations in submerged pieces of wood, 

 such as piles, ships' bottoms, &c., perfor- 

 ating and destroying them in all direc- 

 tions. The T. navalis, Lin., is justly cele- 

 brated. It is thought to have been im- 

 ported into Europe from the torrid zone. 

 It is highly destructive in our ports, and 

 has more than once threatened Holland 

 with ruin, by the destruction of its dikes. 

 It is upwards of six inches in length. 



TERGEM'INOCS, Lat. tergeminus, doubly 

 twin-forked. Applied to a leaf-stalk when 

 it has two leaflets at the end of each, and 

 two more at the fork. 



TERM, Lat. terminus, from nauet, a 

 limit. 1. In the arts, &c.,a word, which, 

 besides its popular and grammatical mean- 

 ing, has a peculiar force or import in the 

 language of some particular art, science, 

 trade, &c. A word become* ft wnn wL 



