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PM US English

Past Master

PMs in PM US English

(In the context of Internet message boards) a private message, sent directly from one user to another

Pm US English

The chemical element promethium

p.m. US English

After noon, used after times of day between noon and midnight

promethium US English

The chemical element of atomic number 61, a radioactive metal of the lanthanide series. It was first produced artificially in a nuclear reactor and occurs in nature in traces as a product of uranium fission

Pm in promethium US English

The chemical element of atomic number 61, a radioactive metal of the lanthanide series. It was first produced artificially in a nuclear reactor and occurs in nature in traces as a product of uranium fission