midtread

As a noun terms

is .

As an adjective midtread is

(comptheory|data compression) having a zero-valued reconstruction level (analogous to a tread of a stairway).

In comptheory data compression terms the difference between midtread and midrise

is that midtread is having a zero-valued reconstruction level (analogous to a tread of a stairway) while midrise is having a zero-valued classification threshold (analogous to a riser of a stairway).

As a noun midrise is

a building which is neither high- nor low-rise.