ˈ ̷ ̷ˌ ̷ ̷ noun
( -s )
Usage: often attributive
Etymology: from the phrase hold fast
1. : something that secures, holds in place, or supports: as
a.
(1) : a rhizoidal base resembling a sucker but without absorption cells by which the thallus of many algae (as seaweeds) is attached to its support
(2) : a discoid extremity of a tendril in certain plants (as the Virginia creeper) by which the vines fix themselves to flat surfaces
b. : an organ (as the acetabulum of a trematode or the scolex of a tapeworm) by which a parasitic animal attaches itself to its host
2. : something to which something else (as a guy line or tackle) may be secured firmly
3. : an actinomycotic tumor of the jaw — not used technically