Physical geography. By Mary Somerville ...

GLO SS ARt Y. 5,5i
TouRnNrFo'T'rTA After Tournefoit. A genus of plants of the family of Borra..gi'neae.
TIALCHIYTE. From the Gr. trac7lus, rough. A variety of lava. A feldspalib
rock, which often contains glassy feldspar and hornblende. When the fe 1spar crystals are thickly and uniformly disseminated, it is called trac7hy'e
por'plhyry.
TRAP. From the Swedish tran2pc, a flight of stairs, because traIp rocks frequently
occur in large tabular masses rising one above another like the successive
steps of a stair-case. Applied to certain igneous rocks composed of feldspar,
augite, and hornblende.
TRA'PPEAN. Belonging to trap rocks.
TREfMA'NDRA. A genus of plants of the family of Tremandrea.
TRI'As. From the Lat. tres, three. Synonym of the tridssic system of rocks,
consisting of the 3Bunter sancstein, the.luschel/ccal/ and Kecper, a group of
sandy marls of variegated colors.
TRICHO'sMANES. From the Gr. trichos, hair, and mnania, madness, excess. A
genus of plants of the class of Cryptoga'mia. Tricho'manes brevise'tnm.
Short-styled trichdmanes.
TRICYtRTIs. From the Gr. treis, three, and l7urtis, a sack or pouch. A genus
of plants of the family of Melanthtceae.
TRIDENTA'TA. Lat. Three-toothed; having three teeth.
TRIGONOCE'PIIALUS. From the Gr. treis, three, gonos, an angle, and ckevphale,
head. A genus of very venomous serpents. Trigonloce'phalus lanceola'tuss.
Lance-head viper.
TRI'LOBITE. From the Lat. tres, three, and lobus, lobe. A genus of fossil crustaceans.
TRI'ONYX. From the Gr. treis, three, and onuex, a nail. A genus of Chelonians.
TRIo'STEUaM. From the Gr. treis, three, and osteon, a bone, a nut. A genus of
plants of the family of Caprifoliaceee.
Tu'FA. Italian. A volcanic rock, composed of an agglutination of fragmented
scorie.
TUNG'STEN. Swedish. Heavy stone. A metal which is hard, white, brittle, and
difficult to fuse.
Tu'RDus. Lat. A thrush. Name of a genus of birds.
Tu'nQUOISE. A blue mineral found in Persia; its color depends on the presence
of oxide of copper.
UMiBEL. A form of inflorescence, in which several peduncles expand so as to
produce a flower somewhat resembling a parasol when open.
UMIBELLI'FERuE. From mbfella, a sun-shade, and fero, I bear. Name of a
family of plants.
UMIBELLI/FEROUS. Bearing umbels. Belonging or relating to the Umbelli'fere.o
UNCINA'TA. Lat. From uncus, a hook. Hooked; having hooks.
UPHEAV'AL. The elevation of land by earthquakes.
URANIJUM. A metal discovered by Klaproth, in 1789.
URSI'NUS. Lat. Belonging or relating to bears.
USNEOI'DES. From u'sne, a kind of lichen, and the Gr. eidos, resemblance. Resembling the u'sne.
U'RENS.. Lat. Burning.
VA'cUUeM. From the Lat. vacuuts, empty. A portion of space void of matter.
VAGINA'LIS. Lat. From vagina, a sheath. A genus of birds.
VANA'DIUM. A silvery white metal, discovered originally by Del Rio, in 1801,
but not admitted until 1830.
VANs:'SSA. A genus of butterflies. Vane'ssca ca'rdui, the painted lady butterfly.
VERONI'CA. A genus of planits of the family of Scrophularfina.
VEa'RTE1n, A. From the Lat. vertere, to turn. A joint or bone of the spine.
Ve'?teb cral co'lunl,, is the spine or back-bone.
VERn/TEIRATE. IHaving vertebrae, or a spine.
VERT'ICOST. Whorl-like.
VBNENI'FILUA. Lat. Flowing with poison.
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