Alkaline \Al"ka*line\ (?; 277), a. [Cf. F. alcalin.]

Of or pertaining to an alkali or to alkalies; having the properties of an alkali.

Alkaline earths, certain substances, as lime, baryta, strontia, and magnesia, possessing some of the qualities of alkalies.

Alkaline metals, potassium, sodium, c[ae]sium, lithium, rubidium.

Alkaline reaction, a reaction indicating alkalinity, as by the action on limits, turmeric, etc.

Source: Webster's Revised Unabridged Dictionary (1913)