-
ammonium
0
n 1: the ion NH4 derived from ammonia; behaves in many respects
like an alkali metal ion [syn: ammonium, ammonium ion]
-
euphonium
0
n 1: a bass horn (brass wind instrument) that is the tenor of
the tuba family
-
gadolinium
0
n 1: a ductile silvery-white ductile ferromagnetic trivalent
metallic element of the rare earth group [syn:
gadolinium, Gd, atomic number 64]
-
harmonium
0
n 1: a free-reed instrument in which air is forced through the
reeds by bellows [syn: harmonium, organ, reed organ]
-
pandemonium
0
n 1: a state of extreme confusion and disorder [syn: chaos,
pandemonium, bedlam, topsy-turvydom, topsy-
turvyness]
-
plutonium
0
n 1: a solid silvery grey radioactive transuranic element whose
atoms can be split when bombarded with neutrons; found in
minute quantities in uranium ores but is usually
synthesized in nuclear reactors; 13 isotopes are known with
the most important being plutonium 239 [syn: plutonium,
Pu, atomic number 94]
-
polonium
0
n 1: a radioactive metallic element that is similar to tellurium
and bismuth; occurs in uranium ores but can be produced by
bombarding bismuth with neutrons in a nuclear reactor [syn:
polonium, Po, atomic number 84]
-
titanium
0
n 1: a light strong grey lustrous corrosion-resistant metallic
element used in strong lightweight alloys (as for airplane
parts); the main sources are rutile and ilmenite [syn:
titanium, Ti, atomic number 22]
-
uranium
0
n 1: a heavy toxic silvery-white radioactive metallic element;
occurs in many isotopes; used for nuclear fuels and nuclear
weapons [syn: uranium, U, atomic number 92]
-
zirconium
0
n 1: a lustrous grey strong metallic element resembling
titanium; it is used in nuclear reactors as a neutron
absorber; it occurs in baddeleyite but is obtained chiefly
from zircon [syn: zirconium, Zr, atomic number 40]
-
herculaneum
0
n 1: ancient city; now destroyed
-
minium
0
n 1: a reddish oxide of lead (Pb3O4) used as a pigment in paints
and in glass and ceramics [syn: red lead, minium]
-
conium
0
n 1: small genus of highly toxic biennials: hemlock [syn:
Conium, genus Conium]
-
meconium
0
n 1: thick dark green mucoid material that is the first feces of
a newborn child
-
syconium
0
n 1: the fleshy multiple fruit of the fig consisting of an
enlarged hollow receptacle containing numerous fruitlets
-
archegonium
0
n 1: a female sex organ occurring in mosses, ferns, and most
gymnosperms
-
pelargonium
0
n 1: geraniums native chiefly to South Africa; widely cultivated
[syn: Pelargonium, genus Pelargonium]
-
asplenium
0
n 1: in some classification systems placed in family
Polypodiaceae [syn: Asplenium, genus Asplenium]
-
helenium
0
n 1: genus of American herbs with flowers having yellow rays:
sneezeweeds [syn: Helenium, genus Helenium]
-
hymenium
0
n 1: spore-bearing layer of cells in certain fungi containing
asci or basidia
-
quadrennium
0
n 1: a period of four years
-
quinquennium
0
n 1: a period of five years
-
gonium
0
-
calcaneum
0
-
pericranium
0
-
iconium
0
-
stramonium
0
-
cuprammonium
0
-
positronium
0
-
spermogonium
0