Adjective
metal-poor (comparative more metal-poor, superlative most metal-poor)
Having a relatively low metal content
Alternative explanations of the scarcity of metal-poor red dwarfs, such as their dimness and scarcity, are considered less likely because they appear to conflict with stellar-evolution models. Source: Internet
Another possibility is that the star formed from an interstellar medium of gas and dust that was unusually metal-poor. Source: Internet
Hence type I are referred to as "metal-rich" ( e.g. Terzan 7 citation ) while type II are "metal-poor" (e.g. ESO 280-SC06 citation ). Source: Internet