/pen"tad/ , n.
1. a period of five years.
2. a group of five.
3. the number five.
4. Chem. a pentavalent element or group.
5. Climatol. a period of five consecutive days.
[ 1645-55; pentad- (s. of pentás ) group of five. See PENT-, -AD 1 ]
/pen"tad/ , n.
1. a period of five years.
2. a group of five.
3. the number five.
4. Chem. a pentavalent element or group.
5. Climatol. a period of five consecutive days.
[ 1645-55; pentad- (s. of pentás ) group of five. See PENT-, -AD 1 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012