Meaning
Any small, non-acid-soluble (i.e. non-carbonate, non-siliceous) organic fossil that cannot be classified.
Etymology
Origin: Ancient Greek
From Ancient Greek ἄκριτος (ákritos, “doubtful, indistinguishable”) + ἀρχή (arkhḗ, “beginning, origin”).
NYT Puzzle Appearances
No published puzzle dates on file for this word yet. It is part of the official NYT Spelling Bee word list for 2019, 2021, 2022, 2023, 2024, 2025, 2026.