normal visual acuity, as measured by the ability to read charts at a distance of 20 feet
denoting a quantity consisting of 20 items or units
the cardinal number that is the sum of nineteen and one
the basic unit of thermodynamic temperature adopted under the Systeme International d'Unites
the 11th letter of the Roman alphabet
the 11th letter of the Roman alphabet
a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite
denoting a quantity consisting of 1,000 items or units
