IHC noun4 •International Harvester Company, a former machinery-building company and the tractor brand named for it. •Initialism of immunohistochemistry. •Homoglyphic approximation of monogram ΙΗϹ or ΙΗΣ (IĒS) from ΙΗϹΟYϹ (IĒSOYS), the Greek form of Jesus. •Initialism of Indian Head cent. formsIHCs