Skip to definition.
Get the FREE one-click dictionary software for Windows.
NEW iPhone Audio English dictionary


Noun: protoactinium  `prow-tow-ak'ti-nee-um
  1. A short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
    - protactinium, Pa, atomic number 91

Type of: metal, metallic element

Encyclopedia: Protoactinium

Nearest

prothrombinase
protirelin
protist
Protista
protistan
Protium
Protium guianense
Protium heptaphyllum
proto
proto-
protoactinium
protoanthropology
protoarchaeology
protoarcheology
protoavis
protoceratops
protocol
protoctist
protoctist family
protoctist genus
protoctist order