Kata bahasa Indonesia
English word
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
Link, Gadget and Share 
WORDNET DICTIONARY
Noun protactinium has 1 sense
- protactinium(n = noun.substance) atomic number 91, pa, protoactinium - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead; is a kind of metal, metallic element
CIDE DICTIONARY
protactinium,
The radioactive chemical element, of atomic number 91; Atomic symbol Pa; at. wt. of longest-lived isotope, 231 (T = 32,500 yrs.) Also called brevium, Uranium X2 and UX2. [PJC]
OXFORD DICTIONARY
protactinium, n. Chem. a radioactive metallic element whose chief isotope yields actinium by decay.
Usage
Symb.: Pa.
Etymology
G (as PROTO-, ACTINIUM)