quenched steel
— Noun
– English
～ steel that has been hardened by immersing it in water or oil to cool it
quasi-stellar radio source
— Noun
– English
～ a starlike object that may send out radio waves and other forms of energy; many have large red shifts
Quercus stellata
— Noun
– English
～ small deciduous tree of eastern and central United States having dark green lyrate pinnatifid leaves and tough moisture-resistant wood used especially for fence posts