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[ro-stel-uh m] /rɒˈstɛl əm/
noun, plural rostella
[ro-stel-uh] /rɒˈstɛl ə/ (Show IPA)
Biology. any small, beaklike process.
Botany. a beaklike modification of the stigma in many orchids.
  1. a projecting part of the scolex in certain tapeworms.
  2. a part of the mouth in many insects, designed for sucking.
Origin of rostellum
1750-60; < New Latin; Latin: little beak, snout, diminutive of rōstrum snout (see rostrum); for formation, see castellum Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for rostellum


noun (pl) -la (-lə)
(biology) a small beaklike process, such as the hooked projection from the top of the head in tapeworms or the outgrowth from the stigma of an orchid
Derived Forms
rostellate, rostellar, adjective
Word Origin
C18: from Latin: a little beak, from rōstrum a beak
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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rostellum in Medicine

rostellum ros·tel·lum (rŏ-stěl'əm)
n. pl. ros·tel·la (rŏ-stěl'ə)
A small beaklike part, such as the hooked projection on the head of a tapeworm.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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