dial. [app. short for clammer = clamber, used of a foot-bridge.] A plank or crossing-stone over a brook.
1746. Exmoor Scolding (1828), 12. Dest’nt remember whan tha com’st over tha clam … when tha water was by stave.
1861. Smiles, Engineers, I. 240. There is a fourth [bridge] on the Blackabrook, consisting of a single stone or clam.
