IPA: /ɪˈmædʒɪnəl/
KK: /ɪˈmædʒɪnəl/
Relating to an image or the final stage of an insect's development.
The imaginal stage of the butterfly is when it emerges from the chrysalis.
Imaginal is formed from "imagin-" (from Latin "imaginari", meaning to form a mental image) and "-al" (meaning relating to). The word refers to something that relates to or is characteristic of imagination or mental imagery.
Think of 'imagine' as forming a mental picture, and '-al' means relating to. So, imaginal relates to the realm of imagination.