English-Thai Dictionary
heptad
N จำนวน เจ็ด
Webster's 1913 Dictionary
HEPTAD
Hep "tad, n. Etym: [L. heptas the number seven. Gr. "epta ` seven. ](Chem. )
Defn: An atom which has a valence of seven, and which can be theoretically combined with, substituted for, or replaced by, seven monad atoms or radicals; as, iodine is a heptad in iodic acid. Also used as an adjective.
HEPTADE
Hep "tade, n. Etym: [Cf. F. heptade. See Heptad. ]
Defn: The sum or number of seven.
New American Oxford Dictionary
heptad
hep tad |ˈhepˌtad ˈhɛpˌtæd | ▶noun technical a group or set of seven. ORIGIN mid 17th cent.: from Greek heptas, heptad-, from hepta ‘seven. ’
Oxford Dictionary
heptad
heptad |ˈhɛptad | ▶noun technical a group or set of seven. ORIGIN mid 17th cent.: from Greek heptas, heptad-, from hepta ‘seven ’.
The Wordsmith Dictionary