His' rule (medicine) and nitromersol (medicine)

His' rule (medicine)

His' rule

The duration of Pregnancy is calculated from the first day of the first omitted menstrual period; obsolete.

nitromersol (medicine)

nitromersol

The anhydride of 4-nitro-3-hydroxymercuriorthocresol; a synthetic organic mercurial compound, used as an antiseptic for skin and mucous membranes.

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