XYLO 



348 



YUCCA 



chiefly iron ore; also called Mountain-wood, 

 from its woody appearance. 



Xylo, (zi'lo). [Gk. xylon, wood.] A prefix 

 implying some relation to wood. 



Xylocopa, (zi-lok'o-pa). [Gk. xylon, wood; 

 koplo, I cut.] Carpenter bees: insects be- 

 longing to Hymenoptera. 



Xylography, (zi-log'ra-fi). [Gk. xylon, wood; 

 grapho, I write.] Wood-cutting ; wood- 

 engraving ; the art of cutting designs on 

 wood for the purpose of being printed, 

 from. 



Xylol, (zllol). [Gk. xylon, wood.]=C 8 H 10 = 

 Dimethyl benzol : a hydrocarbon obtained 

 from wood-spirit. 



Xylophagi, (zi-lofa-ji). [Gk. xylon, wood; 

 phago, I eat.]=Timber-eaters=Hyleimd: 

 a family of insects belonging to Coleoptenu 



Xylopia. (zi-ld'pi-a). A pl;mt belonging to 

 Anonaceaj. X. glabra=^ Bitter wood. 



Xylophyll*, (zMofil-a). [Gk. xylon, wood; 

 phyllon, leaf.] W. Indian plants, belonging 

 to Euphorbiacese. 



Xylyl, (zllil). [ Gk. xylon, wood; hyle, 

 material J The radicle of the xylylio aeries 

 of compounds; also called Formyl. 



XylyliarzCgHjiN : an oily base belonging to 

 the aniline senes. 



Xyridace, (zi-ri-da'se-8). [Xyris, the typirnl 

 genus. ]=Xy rids: herbaceous plants, elm tiy 

 tropical, with thread-like leaves and gay 

 terminal flowers, belonging to Xyridalus. 



Xyridales, (zi-ri-da'lez). [Xyridacew, q.v.]= 

 Water-wort*, spider-worts, &c.: plants with 

 bisexual tripetaloid flowers, forming a divi- 

 sion of Endogeus. 



Y. 



Yacht, (yot). [Jagi, the Dutch word.] A 



sea-going vessel adapted for speed or for 



pleasure-travelling. 

 Yak, (yak)=Poephagu: an ox-like animal, 



belonging to Bovidae, found in Central Asia. 

 Yams, (yamz). (Jhanie, the W. Indian name.] 



l.=Dioscoreaceie,?.v. 2. The 



fniit : large fleshy tubers, 



much used for food. 

 Yapock, (ya'pok)=Didelphis 



paJmata : a semi -aquatic 



marsupial animaL 

 Yard, (yird). [A.-S. geard, a 



measuring rod. ] The stand- 

 ard measure of length =36 



in.=38?8H of the len th 



of a pendulum which oscillates once every 



second at the sea-level. Golden T., v. Orion. 



Yarn, (yarn). [Oearn, the A.-S. word.] 1. 

 Woollen threads. 2. A general term for 

 thread, whether of wool, cotton, or linen. 



Yarrow, (yar'ro) = Achillea millefolium : a 

 plant belonging to Asteracese. 



Yawl. (yawl). (Jol, the Dutch word.] A 

 small launch, about 25 feet long; also called 

 Jolly-boat. 



Year, (y6r). [Gear, the A.-S. word.] The 

 time required for one revolution of the Earth 

 round the Sun. Anomalistic F.=365 days 

 6 h. 13 m. 49-3 sec. Civil Y. =365 days 5 h. 

 4Sra. 497 sec. Julian Y.=0regorian F.= 

 305 days 6 h. Sidereal T.: time of recurrence 

 of a given fixed star in the same position= 

 365 days 6 h. 9 m. 9'6 sec. Solar 7. : interval 

 between two passages through the vernal 

 equinox=365 days 5 h. 48 m. 46 sec. 



Yeast, (yest). [Gist, the A.-S. word.]=Torulae 

 =Barm : minute fungi, belonging to Muce- 

 dines, reproduced by gemmation; used to 

 produce alcoholic fermentation of eugar. 

 German Y.: dried yeast, imported in cakes, 

 obtained by the brewing of Bavarian beer. 



Yelk, (yelk). [Geolca, the A.-S. word.]= 

 Yitellus; also called Yolk. 



Yellow, (yello). [Geolu, the A.-S. word.) 

 One of tlie colours of the spectrum. Imim n 

 T. = Euxanthate of magnesium. Napla Y. , 

 v. Naples. Y. baltam, v. Impatiens. Y. 

 <*ntaury=Chlora, q.v. Y. coratn=Aurin.-, 

 o.r. Y. dyet: obtained from fustic, morin- 

 din, turmeric, weld, Ac. Y. flag; Iris pseu- 

 dacoras. Y. Aammr=Enihriza citrinella. 

 }'. light exerts no chemir.il action, v. 

 Actinism. Y. 7ne*af=Muntz's metal. Y. 

 ochre: a clay coloured with oxide of iron: an 

 earthy variety of limonite, q.v. Y. pigments: 

 obtained from antimony, arsenic, chalk, 

 chromium, lead, &c. Y. race: include* 

 Chinese, Esquimaux, Japanese, Lappn, Mon- 

 gols, &c. Y. raftf=Rninanthus, q.v. Y. 

 nato=Chilabrothrus inomatus. Y. tpol: in 

 the retina of the eye, v. Macula lute.i ami 

 Foramen. Y. ttart: Altair, Arcturus, Kocab, 

 Polaris, Procyon, Rigel, &c. Y. irater-lily= 

 Nuphar, q.v. Y. wor<=Y. centaury, q.v. 



Yew, (Q). [Eow, the A.-S. name.] = Taxus, 



-K'(il). [Gk. hyle, 

 material.] A ter- 

 mination used for 

 the names of chemi- 

 cal radicles. 



Yorubans. An Af- 

 rican people. 



Yphantet,(i-fan'tez). 

 [Gk. yphantes, wea- 

 ver.) A bird, v. 

 Oriole. 



Yponomenta,(T-pon- Yew. 



6-mQ'ta.) [Gk. yponomeutes, miner.]=nypo- 

 nomeuta : a moth. Y. padella = Ermine 

 moth. 



Yttria, (it'ri-a). [Ytterby, in Sweden.]=YO: 

 oxide of yttrium, a rare earth. 



Yttrium, (it'ri-um). [Yttria/ 3. r.]=Y: one of 

 the earth metals; very rare. 



Yucca, (yok'ka). A plant belonging to Lili- 

 ace; also called Adam's needle. 



