a feature that in combination produces amphid sodium; applied by Jöns Jacob Berzelius to oxygen, sulphur, selenium, and tellurium.
An element that in combo creates amphid salt; -- applied by Berzelius to air, sulphur, selenium, and tellurium.
In botany, a thallogen: a name used by Brongniart to those cryptogams (the algæ, fungi, and lichens) which boost by growth of cellular structure in all directions, and never at the summit of a distinct axis.
2. In chem., a component, like air, capable of developing with other elements acid and basic substances.