/hep"tad/ , n.
1. the number seven.
2. a group of seven.
3. Chem. an element, atom, or group having a valence of seven.
[ 1650-60; heptad- (s. of heptás ). See HEPTA-, -AD 1 ]
/hep"tad/ , n.
1. the number seven.
2. a group of seven.
3. Chem. an element, atom, or group having a valence of seven.
[ 1650-60; heptad- (s. of heptás ). See HEPTA-, -AD 1 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012