ulcerate

v [I, Tn] (cause sth to) become affected with an ulcer or ulcers （使某物）形成溃疡: Aspirin can ulcerate the stomach lining. 阿司匹林能造成胃壁溃疡.

ubiquitous, ubiquity, UCCA, UDA, udder, UDI, UDR, UEFA, UFO (also ufo), ugh, ugli, ugliest, ugliness, ugly, ugly-looking, UHF, UHT, UK, ukulele, ulcer, ulceration, ulcerous, ulna, ulterior, ultimate, ultimately, ultimatum, ultimo, ultra violet, ultra-, ultramarine, ultrasonic, ultrasound, ultraviolet, ululate, ululation, Ulyanovsk, umber, umbilical, umbilical cord,