| slovo | definícia |
Thalli
(gcide) | Thallus \Thal"lus\, n.; pl. Thalli. [NL., fr. Gr. ? young
shoot or branch, frond.] (Bot.)
A solid mass of cellular tissue, consisting of one or more
layers, usually in the form of a flat stratum or expansion,
but sometimes erect or pendulous, and elongated and
branching, and forming the substance of the thallogens.
[1913 Webster] |
| | podobné slovo | definícia |
pleurothallis
(encz) | pleurothallis, n: |
thallium
(encz) | thallium,talium n: Zdeněk Brožthallium,thalium n: Zdeněk Brož |
Prothalli
(gcide) | Prothallus \Pro*thal"lus\, n.; pl. Prothalli. [NL., fr. Gr. ?
before + ? a young shoot.] (Bot.)
The minute primary growth from the spore of ferns and other
Pteridophyta, which bears the true sexual organs; the
oophoric generation of ferns, etc.
[1913 Webster] |
Prothallia
(gcide) | Prothallium \Pro*thal"li*um\, n.; pl. Prothallia. [NL.] (Bot.)
Same as Prothallus.
[1913 Webster] |
Prothallium
(gcide) | Prothallium \Pro*thal"li*um\, n.; pl. Prothallia. [NL.] (Bot.)
Same as Prothallus.
[1913 Webster] |
Thallic
(gcide) | Thallic \Thal"lic\, a. (Chem.)
Of or pertaining to thallium; derived from, or containing,
thallium; specifically, designating those compounds in which
the element has a higher valence as contrasted with the
thallous compounds; as, thallic oxide.
[1913 Webster] |
Thalline
(gcide) | Thalline \Thal"line\, a. (Bot.)
Consisting of a thallus.
[1913 Webster]Thalline \Thal"line\, n. [Gr. ? a young shoot or branch.]
(Chem.)
An artificial alkaloid of the quinoline series, obtained as a
white crystalline substance, C10H13NO, whose salts are
valuable as antipyretics; -- so called from the green color
produced in its solution by certain oxidizing agents.
[1913 Webster] |
Thallious
(gcide) | Thallious \Thal"li*ous\, a. (Chem.)
See Thallous.
[1913 Webster]Thallous \Thal"lous\, a. (Chem.)
Of or pertaining to thallium; derived from, or containing,
thallium; specifically, designating those compounds in which
the element has a lower valence as contrasted with the
thallic compounds. [Written also thallious.]
[1913 Webster] |
thallious
(gcide) | Thallious \Thal"li*ous\, a. (Chem.)
See Thallous.
[1913 Webster]Thallous \Thal"lous\, a. (Chem.)
Of or pertaining to thallium; derived from, or containing,
thallium; specifically, designating those compounds in which
the element has a lower valence as contrasted with the
thallic compounds. [Written also thallious.]
[1913 Webster] |
Thallium
(gcide) | Thallium \Thal"li*um\, n. [NL., fr. Gr. ? young or green shoot
or branch, twig. So called from a characteristic bright green
line in its spectrum.] (Chem.)
A rare metallic element of the aluminium group found in some
minerals, as certain pyrites, and also in the lead-chamber
deposit in the manufacture of sulphuric acid. It is isolated
as a heavy, soft, bluish white metal, easily oxidized in
moist air, but preserved by keeping under water. Symbol Tl.
Atomic weight 203.7.
[1913 Webster] |
genus pleurothallis
(wn) | genus Pleurothallis
n 1: large genus of epiphytic or lithophytic orchids of tropical
America |
pleurothallis
(wn) | pleurothallis
n 1: any of numerous small tufted orchids of the genus
Pleurothallis having leathery to fleshy leaves and racemes
of 1 to many small flowers |
thallium
(wn) | thallium
n 1: a soft grey malleable metallic element that resembles tin
but discolors on exposure to air; it is highly toxic and is
used in rodent and insect poisons; occurs in zinc blende
and some iron ores [syn: thallium, Tl, {atomic number
81}] |
thallium
(elements) | thallium
Symbol: Tl
Atomic number: 81
Atomic weight: 204.3833
Pure, unreacted thallium appears silvery-white and exhibits a metallic
lustre. Upon reacting with air, it begins to turn bluish-grey and looks
like lead. It is very malleable, and can be cut with a knife. There are
two stable isotopes, and four radioisotopes, Tl-204 being the most
stable
with a half-life of 3.78 years. Thallium sulphate was used as a
rodenticide.
Thallium sulphine's conductivity changes with exposure to infrared
light,
this gives it a use in infrared detectors. Discovered by Sir William
Crookes
via spectroscopy. Its name comes from the Greek word thallos, which
means
green twig. Thallium and its compounds are toxic and can cause cancer.
|
|