holdfast

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

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.

4. (archaic)Actinomycosis.

1. On the rocks where the holdfasts secure kelp fronds to the bottom live many invertebrates including abalone, sea urchins and sea stars.

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