півторамісячний

Etymology
From. Compare 🇨🇬, 🇨🇬, 🇨🇬.

Adjective

 * 1) one-and-a-half-month  having a duration of a month and a half
 * 2) one-and-a-half-month-old, one and a half months old  having an age of a month and a half