holdfast

noun4

1. •
   Something to or by which an object can be securely fastened.

   • And Ivy divided from the root, we have observed to live some years, by the cirrous parts commonly conceived but as tentacles and holdfasts unto it. — 1658
2. •
   A root-like structure that anchors aquatic sessile organisms, such as seaweed, other sessile algae, stalked crinoids, benthic cnidarians, and sponges, to the substrate.
3. •
   The aspect of a character that experiences destructive temptation.

   • Alienation: A stage on the downside of the passage wherein the holdfast and the antihero take actions which bring about a disintegration of personality. — 2006
4. •
   (no longer used) Actinomycosis.