ultra- prefix repr. L. ultrā beyond, rel. to ULTERIOR, etc.; in mod. use (from early XIX) a living prefix
1. prepositionally, surpassing the limits of (the specified concept), as ultra-human;

2. adverbially, marked by an extreme degree of the quality denoted by the adj. qualified;

3. spec. in ultra-violet applied to the rays beyond the violet end of the visible spectrum;

4. denoting instruments recording very minute measurements, as ultramicroscope.

ultra- • prefix 1. beyond; on the other side of: ultramontane. Often contrasted with cis-.2. extreme; to an extreme degree: ultramicroscopic ultraradical.

ultra- prefix denoting
1. beyond.

2. an extreme degree (e.g. of large or small size).