Definition of polypoid in US English:



  • 1Zoology
    Relating to or resembling a polyp or hydra.

    ‘a polypoid colonial form’
    • ‘In its microstructure and gross anatomy, Hyolithelius is most similar to Byronia and to thecae of polypoid coronalids.’
    • ‘For the reasons outlined above in the first paragraph and explained in more detail in Van Iten et al., we here interpret Sphenothallus as a thecate polypoid cnidarian whose systematic position within this phylum is uncertain.’
    • ‘These attributes are obliterated when it undergoes metamorphosis into a sessile polypoid adult.’
    • ‘Byronia is most similar to thecae of polypoid coronalids, an extant group of scyphozoans that have been allied with conulariids.’
    1. 1.1 Relating to or denoting the polyp stage in the life cycle of a coelenterate.
      Also called hydroid
      Compare with medusoid
      • ‘The polypoid stage represents the asexual phase of its life cycle.’
      • ‘A life cycle including both polypoid and medusoid phases that can be separate in space and scarcely overlapping in time characterizes many hydrozoans and most scyphozoans.’
  • 2Medicine
    (of a growth) resembling or in the form of a polyp.

    ‘a benign polypoid lesion’
    • ‘By sigmoidoscopy, a submucosal ovoid polypoid mass measuring about 2 cm in greatest dimension was identified at 4 cm above the anal verge.’
    • ‘Laryngoscopy revealed a polypoid lesion implanting on the anterior aspect of the subglottic cone.’
    • ‘At the time of cholecystectomy, the gallbladder was noted to have a thickened wall and a polypoid mass arising in the neck of the gallbladder.’
    • ‘Physical examination revealed a polypoid lesion at the right margin of the tongue.’
    • ‘Physical examination revealed a pedunculated polypoid mass measuring 0.5 cm in greatest dimension involving the midanterior two thirds of the right tongue blade.’