Spirits of soap (spiritus saponatus) SPIRITUS SAPONATUS NL: spiritus saponatus, spirits of soap DE: Seifenspiritus, Spiritus saponatus Definition NL: a 30 % solution of sapo kalicus prepared from oleum Olivarum and KOH in dilute spiritus acetonatus containing 0.2 % oleum aromatic; antiseptic for skin and instruments.