holdfast


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holdfast

(hōld′făst′)
n.
1. Any of various devices used to fasten something securely.
2. Biology An organ or structure of attachment, especially the basal, rootlike formation by which certain seaweeds or other algae are attached to a substrate.

holdfast

the basal part of the stripe (stalk) of large seaweeds such as Fucus , Laminaria, attaching the plant to the substrate.
References in periodicals archive ?
Only 12 local governments answered the second round: Holdfast Bay and Melbourne in Australia, Mataro, Mostoles and San Cugat in Spain, Austin, Charlotte, Maricopa, San Jose, Scottsdale and Tucson in the USA, and Lulea in Sweden.
The sub-divisions of these sections are based on a more detailed description of receptacle morphology and reproduction strategies (dioecy, monoecy, male/female dimorphism or not), and to a less extent on the morphology of vesicles, holdfast or axes.
The holdfast is a structure biologists don't entirely understand," writes the Oregon State distinguished professor of philosophy.
After germination the seeds all formed holdfast roots to the cork host; but later generations do not show any interest in forming roots and rely on the plant structure for attachment (fig.
Each individual was collected by prying its holdfast free from the rock, taking care to avoid damaging any portion of the organism.
Le Guin's Hainish novels, James Blish's Cities in Flight quartet, Suzy McKee Charnas's Holdfast Chronicles, Frank Herbert's Dune series, and Cordwainer Smith's stories of the Instumentality of Mankind.
This type of fossil usually has a long and narrow but flexible, gently tapering tube with a cup-like attachment disc, or holdfast, at the pointed end, which once anchored the organism to the sea floor, or to a hard surface such as a shell or another Sphenothallus.