Did you mean imago?
imago
noun
°The final developmental stage of an insect after undergoing metamorphosis.
"1973: ‘But still,’ he said to himself, drawing the metamorphoses of a red admiral, egg, caterpillar, chrysalis and imago on his pad, ‘what shall I say to him when we meet?’ — Patrick O'Brian, HMS Surprise"
°An idealised concept of a loved one, formed in childhood and retained unaltered in adult life.