This is the 17774th most frequent Russian word.
ультра
"Ultra" – extreme, beyond, or exceeding a limit.
The word 'ультра' is used here as a prefix to indicate an extreme degree or quality, modifying 'тонкий' (thin).
Этот смартфон имеет ультра-тонкий дизайн.
This smartphone has an ultra-thin design.
The word 'ультра' is utilized as part of a compound noun to describe a specific type of running characterized by extended distances, emphasizing the special nature of the activity.
Ультра-бег — это бег на сверхдлинные дистанции.
Ultra-running is running over very long distances.
In this example, 'ультра' acts as an intensifier for the adjective 'захватывающим' (captivating), conveying a heightened sense of enthusiasm or exaggeration.