Rostellum Definition

rŏ-stĕləm
rostella
noun
A sterile, flaplike modified stigma that separates the anthers from the stigmas in some orchids.
Webster's New World
A small, rounded projection bearing hooks on the head of certain tapeworms.
Webster's New World
A beak-shaped, sucking mouthpart in certain insects.
Webster's New World

A small beak-like process or extension; a small rostrum.

The rostellum of the stigma of violets, or of the operculum of many mosses.
Wiktionary

(biology) A retractable protruding part at the anterior end of a soft-bodied tapeworm; the scolex from which it protrudes is often armed with hooks which serve to keep it in place attached to the host.

Wiktionary

Other Word Forms of Rostellum

Noun

Singular:
rostellum
Plural:
rostella

Origin of Rostellum

  • Latin diminutive of rōstrum beak rostrum

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin, diminutive of rostrum (“beak").

    From Wiktionary

Rostellum Sentence Examples

  • This column stands up from the base of the flower, almost at right angles to the lip, and it bears at the top an anther, in the two hollow lobes of which are concealed the two pollen-masses, each with its caudicle terminating below in a roundish gland, concealed at first in the pouch-like rostellum at the front of the column.

  • These complex organs have apparently arisen by the increase in depth and differentiation of an accessory sucker such as is borne on the phyllidia of the former group. Lastly, the scolex of the more familiar Taeniidae (Tetracotylea) carries a rostellum encircled with hooks and four cup-shaped suckers the margins of which do not project beyond the surface of the body.

  • In one genus (Polypocephalus) the place of a rostellum is taken by a crown of retractile tentacles.

  • A peculiar modification of this type of scolex occurs in the Echinobothridae, in which the axial part of the organ (the rostellum) is elongated and provided with several rows of hooks, whilst the phyllidia have partially fused.

  • The thicker portion develops a terminal muscular rostellum and two or four suckers, the thinner end (" tail ") is vesicular, more or less elongated, and contains the six embryonic hooks.

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Words Starting With

RROROS

Words Ending With

MUMLUM

Unscrambles

rostellum

Words Starting With R and Ending With M

Starts With R & Ends With MStarts With RO & Ends With MStarts With R & Ends With UM

Word Length

9 Letter Words9 Letter Words Starting With R9 Letter Words Ending With M