SEDILIA 



300 



SENSITIVE 



Segment. 



a b, chord ; a b c, 



Segment. 



Sedilia, (se-dil'i-a). [L. Sedilium, the Latin 

 word.] Seats near the altar, on the south 

 side of a chancel. 



Sedimentary formations, v. Aqueous forma- 

 tions. 



Sedum, (se'dum). [The Latin name.]=:Or- 

 pine, stone-crop: a succulent herb belonging 

 to Crassulaceae. 



Seed, (sed). [Scerf, the A.-S. name.]=0vule 

 and contents; resulting from fertilisation: 

 consists of an embryo and its receptacle or 

 envelope. The portion of a plant which is 

 capable of development into a similar plant. 

 S. buds Ovules. S. Inc, v. Lac. 



Segment, (seg'ment). [Segmentum, the Latin 

 word.] A portion cut off. 



Segmentation, ( seg-men- 

 ta'shun). [Segment, q.v.] 

 1. Specially =Division of 

 yelk: earliest stage of de- 

 velopment. 2. Generally: 

 any division into parts. 



Seine, (sen). [The French 

 word.] A draught net. 

 v. Nets. 



Seismic, (sls'mik). [Gk. 

 seismos, earthquake.] Re- 

 lating to earthquakes. 



Seismology, (sis-mol'6-ji). [Gk. seismos, earth- 

 quake ; logos, discourse.] The science of the 

 causes and effects of earthquakes, or ' wave- 

 shells" of motion of the earth's surface. 



Selachia, (se-lashi-a). [Selachus, g.v.]=^Pla- 

 coidei : sharks, dog-fishes, &c. : fishes form- 

 ing a sub-division of Elasmobranchh. 



Selachus, (sel'a-kus). [Gk. telachos, a car- 

 tilaginous fish.] A large shark ; belongs to 

 Squalidw. S. maximus = Basking shark= 

 Squalus maximus. 



Selaginacese, (sel-aj-in-a'se-e). [Gk. selagon, 

 lycopodium.] Selagids: herbs, chiefly of 

 Cape of Good Hope, between Eschiales and 

 Bignonales. 



Selection, (se-lek'shun). [Selectio, the Latin 

 word.] Natural S. : the survival of those 

 plants and animals best fitted for continuous 

 existence under given conditions, and the 

 gradual extinction of those not so adapted. 

 v. Darwinism. 



Seleniates, isei-e'ni-ats). [Selenic acid, q.v.] 

 Compounds of selenic acid and bases. 



Selenic acid, (se-len'ik). [Selenium, q.v.] = 

 Dihydric 8eleniate=H 2 SeC>4: an acid resem- 

 bling sulphuric acid. Hydro =H2Se: an 

 inflammable gas; also called seleniuretted 

 hydrogen. 



Selenides, (sel'e-nidz). [Selenium, q.v.] Rare 

 mineral substances : compounds of selenium 

 and another element. 



Selenite, (sei'd-nit). A crystalline variety of 

 gypsum, q.v. 



Selenites, (ael'e-nits). ' [Selenium, q.v,] 1. 

 Compounds of selenious acid and a base. 2. 

 Name used for the imaginary inhabitants of 

 the Moon. 



Selenitic, (sel-e-nit'ik). [Selenite, q.v.] Re- 

 lating to, or containing, selenite. S. cement: 

 a compound of lime, gypsum, and sand. 



Selenium, (sel-e'ni-ura). [Gk. sdene, moon.] 



=Se": one of the sulphur group, q.v. A 

 solid substance, resembling sulphur, but 

 darker and heavier. 

 Seleniuretted hydrogen=Hydroselenic acid= 

 Dihydric selenide = HoSe : a colourless in- 

 flammable gas, resembling hydrosulphuric 

 acid. 



Selenography, ( sel-e-nog'ra-fi ). [Gk. selene, 

 moon ; grapho, I write.] The description of 

 the Moon. 



Selenographies!, (sel-e-no-grafi-kal). [Seleno- 

 graphy, q.v.] Relating to the description of 

 the Moon. 



Selen-sulphur. A mineral containing sele- 

 nium and sulphur. 

 Selipsh. An American race. 

 Bella Turcica, (sel'la-ter'si-ka). [The Latin 

 1 1 am e.]= Turkish saddle: a depression in the 

 sphenoid bone. 



Semaphore, (sem'a- for). [G.ema,sign; phoreo, 

 I bear. ] An apparatus 

 for showing signals to 

 be seeu at a distance. 



Semicircle, (sem-i-sr / 

 kl). [L. semi, half; 

 Circle, 7.v.] = Hemi- 

 cycle, half a circle. 



Sermlunar valves. Be- 

 tween the ventricles 

 of the heart and the 

 great arteries. 



Semitic, (sem-it'ik). 

 [Shem, a son of Noah.] 

 S. languages: Arabic, Semaphore 



Babylonian, Ethiopian, Hebrew, and Syrian. 



Semitone, (sem'i-ton). [L. semi, half; Tone, 

 q. v.]= Half atone, v. Tone. 



Semnopithec us, ( sem - no-pi-theTc us ). [G k. 

 semnos, venerable; pithekos, ape.] A large 

 long-tailed Asiatic monkey, having short 

 arms, a small thumb, and ischial callosities; 

 walks on all fours. 



Sempervivum, (sem-per-viv'um). [L. semper, 

 always; vivo, I Jive.]=House-leek; a succu- 

 lent herb belonging to Crassulaceae. 



Senebiera, (vsen-e-bi-a'ra). [Senebier, a Sv 

 botanist.]=: Wart -cress; an herb belonging to 

 Brassicacese. 



Senecio, (sen-e'si-6). [L. senex, old.] An 

 herb belonging to Asteraceae. S. vulgarise 

 Groundsel. 



Senna, (sen'na). A purgative drug, obtained 

 from the plant Cassia, belonging to Legum- 

 inaceap; and from others. 



Sensation, (sen-sa'shun). [Sensut, the Latin 

 word. ]= Feeling: mental impressions derived, 

 by means of the senses, from external objects. 

 v. Senses. 



Sensations=0psaistbenics Feeling, v. Sen- 

 sation. 



Sense animals=Sensual animals: Oken's term 

 for Mammalia. 



Senses, (sen'ses). [L. senms, perception.] Five 

 S.: seeing, hearing, smelling, tasting, and 

 feeling, v. Sensation. 



Sensible. S. horizon, v. Horizon. 



Sensitive, S. animals: v. Lamarck's classi- 

 fication. S. flames: which quiver, and are 

 sometimes extinguished, when a suitable 



