World English Dictionary
rostellum (rɒˈstɛləm)
n , pl -la
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
[C18: from Latin: a little beak, from rōstrum a beak]

Collins English Dictionary - Complete & Unabridged 10th Edition
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