hafnium, Hf, atomic number
(noun) a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
Source: WordNet® 3.1
hafnium (uncountable)
A chemical element (symbol Hf) with an atomic number of 72: a lustrous, silvery-grey tetravalent transition metal.
• celtium (former name)
Source: Wiktionary
30 May 2025
(noun) (sports) a return made with the palm of the hand facing the direction of the stroke (as in tennis or badminton or squash)
The Boston Tea Party helped popularize coffee in America. The hefty tea tax imposed on the colonies in 1773 resulted in America switching from tea to coffee. In the lead up to the Revolutionary War, it became patriotic to sip java instead of tea. The Civil War made the drink more pervasive. Coffee helped energize tired troops, and drinking it became an expression of freedom.
