A mixture, as of pounded ice and salt, producing cold sufficient to freeze a liquid by the rapid absorption of heat.

Huperzia appalachiana.

(paper) duodecimo, or 12mo, a paper size, so called because it is cut 12 to a (huge, originally made) sheet / (printing) a page, book etc. of that size

(mathematics) One of the earlier theorems leading to Roth's theorem (a Diophantine approximation to algebraic numbers), establishing an exponent d/2+1+ε.