noun Etymology: from their being transitional between the more highly and the less highly electropositive elements Date: 1940 any of various metallic elements (as chromium, iron, and nickel) that have valence electrons in two shells instead of only one
TRANSITION METAL
Meaning of TRANSITION METAL in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012