holdfast

holdfast is a   Noun

Definition:

[1] Something used to secure and hold in place something else, as a long fiat-headed nail, a catch a hook, a clinch, a clamp, etc.; hence, a support. "His holdfast was gone." Bp. Montagu.

[2] A conical or branching body, by which a seaweed is attached to its support, and differing from a root in that it is not specially absorbent of moisture.

Synonyms: