: a small process resembling a beak : a diminutive rostrum: such as
a
: an extension of the stigma of an orchid flower
b
: an anterior prolongation of the head of a tapeworm bearing hooks

Examples of rostellum in a Sentence

Recent Examples on the Web
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One of the traits researchers are keenest to explore is one that would eliminate a flap inside the vanilla flowers called the rostellum. Alex Fox, Smithsonian Magazine, 23 Dec. 2020

Word History

Etymology

New Latin, from Latin, diminutive of rostrum beak

First Known Use

1686, in the meaning defined above

Time Traveler
The first known use of rostellum was in 1686

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Cite this Entry

“Rostellum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rostellum. Accessed 21 Mar. 2025.

Medical Definition

rostellum

noun
: an anterior prolongation of the head of a tapeworm often bearing hooks

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