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What does holdfast mean?

Looking for the meaning or definition of the word holdfast? Here's what it means.

Noun
  1. Something to or by which an object can be securely fastened.
  2. (zoology) 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. (medicine) Actinomycosis.
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Examples
The rostellum ends in a holdfast by which the cell is fixed to the gut wall of its host.
Figure 2: Diagrams of Chondrus crispus showing its discoid holdfast and Furcellaria lumbricalis showing its rhizoidal holdfast.
Samples were taken from the harvest for holdfast analysis from each of the landing sites.
Many aquatic bacteria produce an acidic mucopolysaccharide holdfast, which allows them to adhere tightly to rocks or other surfaces.
What do you think has become of Captain Hill and his companions, Mr. holdfast?
Attachment is achieved by flattening a sticky holdfast, which pulls the larva down on top of it.

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