An acid-base indicator which is colorless in acid solution, but turns pink to red as the solution becomes alkaline. It is used medicinally as a cathartic.
Underwing
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Any one of numerous species of noctuid moths belonging
to Catocala and allied genera, in which the hind wings are banded with
red and black or other conspicuous colors. Many of the species are
called red underwing.
Underwing meaning & definition 1 of Underwing.
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The hindwing of an insect, especially when it is normally hidden by a forewing.
Underwing meaning & definition 2 of Underwing.
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