is likely misspelled.
has no English definition.
As a noun heptoxide
is any oxide containing seven oxygen atoms in each molecule.
heptoxide
English
Alternative forms
* heptaoxide
Noun
(
en noun)
(chemistry) any oxide containing seven oxygen atoms in each molecule
Derived terms
* dichlorine heptoxide
* tetraterbium heptaoxide
Not English
has no English definition. It may be misspelled. 