Definition of stannous in US English:

stannous

adjective

Chemistry
  • Of tin with a valence of two; of tin(II).

    Compare with stannic
    • ‘Reduction with stannous chloride alone allowed for selective reduction of inorganic mercury.’
    • ‘For example, sodium fluoride, calcium fluoride, and stannous fluoride are all used to help reduce tooth decay.’
    • ‘Tranexamic acid, D-gluconic acid (hemicalcium salt), dithiothreitol, and stannous chloride were purchased from Sigma (St. Louis, MO).’

Origin

Mid 19th century: from late Latin stannum ‘tin’ + -ous.

Pronunciation

stannous

/ˈstanəs//ˈstænəs/