← Back to stratum
Full Level C2+ →
stratum Etymology Atlas
a layer of material, especially rock, or a level of society Pro
Word
Root
Affix
Tap any word to open its Atlas. Pinch to zoom, drag to pan.
stratum is a Level C2+ word — Pro only
Pro unlocks the Etymology Atlas for levels A2–C2 — plus FSRS-5 spaced repetition, mastery tracking, and the activity dashboard.