Here's what rhymes with ultrastructural.

Consider these alternatives

morphologic / logic histologic / logic neuropathological / logical osteological / logical palynological / logical neurophysiological / logical cytogenetic / magnetic histopathologic / logic histological / logical electrophysiological / logical serologic / logic epistemologies / qualities fenestrated / dated embryological / logical histopathology / quality anatomic / economic tumescence / presence construal / fuel accretions / reasons individualizing / rising serological / teleological