The story
From the Old English river name Hlūde, now the River Teme, + hlǣw (“mountain, hill, mound”).
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Of a geologic epoch within the Silurian period from about 423 to 419 million years ago; marked by the appearance of the millipedes. Full definition →
From the Old English river name Hlūde, now the River Teme, + hlǣw (“mountain, hill, mound”).
Etymology from Wiktionary, CC BY-SA 4.0.