What is the term for icing that can occur between 25 to -15 degrees in moist conditions?

Rime icing is the appropriate term for ice that can form within the temperature range of +25 to -15 degrees Celsius in moist conditions. This type of icing occurs when supercooled water droplets collide with surfaces, such as a wing or propeller, at these temperatures. The rapid freezing of these droplets creates a rough and opaque layer of ice that can significantly affect the aerodynamic properties of an aircraft.

In rime icing, the moisture in the air contributes to the formation of ice at a particular temperature threshold, which aligns with the characteristics described in the question. The resulting ice has a white, frosty appearance and often has a lower density compared to other forms of icing, such as clear icing, which can also occur at warmer temperatures.

The other terms do not fit the conditions specified in the question. Frost icing usually pertains to the formation of ice when temperatures are at or near zero in cold air without moisture present. Hoar frost is related to the deposition of ice crystals under particular conditions, typically in cold and clear situations. Carb icing is not a recognized meteorological term associated with icing conditions in aviation. Therefore, rime icing is the correct answer in this context.