Search Result for "atomic number 91":
Wordnet 3.0

NOUN (1)

1. a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead;
[syn: protactinium, protoactinium, Pa, atomic number 91]


WordNet (r) 3.0 (2006):

atomic number 91 n 1: a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead [syn: protactinium, protoactinium, Pa, atomic number 91]