Where does “plenkreskiĝulino” come from?

plenkreskiĝulino (Esperanto) comes from Esperanto plenkreskiĝulo, from Esperanto kreski, from Latin crēscō, from Proto-Italic krēskō, from Proto-Indo-European ḱer-, from Proto-Indo-European kr̥-, from Proto-Indo-European ker- — army.

Ancestry of “plenkreskiĝulino”, step by step

StepLanguageWordMeaning
1Esperantoplenkreskiĝuloteenager (person who is in the process of fully growing up or maturing)
2Esperantokreskito grow
3Latincrēscōto rise, grow, grow up; prosper, thrive; increase, multiply, augment
4Proto-Italickrēskō
5Proto-Indo-Europeanḱer-to grow, to make grow, to nourish; to plait,...
6Proto-Indo-Europeankr̥-to turn, to bend
7Proto-Indo-Europeanker-army
Every word from Proto-Indo-European ker-Every word from Proto-Indo-European kr̥-Every word from Proto-Indo-European ḱer-