Where does “valkotähkäisyys” come from?

valkotähkäisyys (Finnish) comes from Finnish -inen, from Finnish -uus, from Proto-Finnic -uc — -ness, -hood.

Ancestry of “valkotähkäisyys”, step by step

StepLanguageWordMeaning
1Finnish-inen-like, -ous, -y; -en; Creates adjectives from...
2Finnish-uusForms nouns from adjectives, expressing a quality
3Proto-Finnic-uc-ness, -hood
Every word from Proto-Finnic -uc →Every word from Finnish -inen →Every word from Finnish -uus →