Jim Conlin wrote:

Source: Webster's Revised Unabridged Dictionary (1913)

Killock \Kil"lock\, n. [Cf. Scot. killick ``the flue [fluke] of
an anchor.'' --Jamieson.]
A small anchor; also, a kind of anchor formed by a stone
inclosed by pieces of wood fastened together. [Written also
killick.]

Got it.

The nice thing about the "kind of anchor formed by a stone
inclosed by pieces of wood fastened together" (gee I haven't
seen one of those in years & years) is that it's totally
corrosion free.

DSK