Section 4C. Actions for assault and battery alleging the defendant sexually abused a minor shall be commenced within three years of the acts alleged to have caused an injury or condition or within three years of the time the victim discovered or reasonably should have discovered that an emotional or psychological injury or condition was caused by said act, whichever period expires later; provided, however, that the time limit for commencement of an action under this section is tolled for a child until the child reaches eighteen years of age.

For purposes of this section, “sexual abuse” shall mean the commission of any act against a minor as set forth in section thirteen B, thirteen H, twenty-two, twenty-two A, twenty-three, twenty-four or twenty-four B of chapter two hundred and sixty-five or section two, three, four, four A, four B, seven, eight, thirteen, seventeen, twenty-nine A, thirty-four, thirty-five or thirty-five A of chapter two hundred and seventy-two.