Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dē-calvo, āvi, ātum, 1, v. a. (calvus], to make bald, to remove the hair (late Lat.): locum corporis, Veg. A. V. 2, 48, 3: Sampson a muliere decalvatus, shorn, Hier. adv. Jov. 1, 23: pueros David decalvavit, Vulg. 1 Par. 19, 4; 1 Cor. 11, 6.