protoactinium
[proh-toh-ak-
tin
-ee-
uh
m]
/ˌproʊ toʊ ækˈtɪn i əm/
noun
,
Chemistry
1.
protactinium
.
British Dictionary definitions for
protoactinium
protoactinium
/
ˌprəʊtəʊækˈtɪnɪəm
/
noun
1.
the former name of
protactinium