discoid
/ˈdɪskɔɪd
/adjective technical
Shaped like a disc.Heads on discoid plants have an extra whorl of disc florets instead of ray florets....
- It has been reported that 20 percent of patients with systemic lupus erythematosus will develop discoid skin lesions; however, most patients who have only cutaneous lupus at presentation will not progress to systemic disease.
- A further possibility is discoid lupus erythematosus, the technical term for an autoimmune dermatitis of dogs that is usually confined to the face and is frequently made worse by exposure to ultraviolet light.
noun
A thing that is shaped like a disc, particularly a type of ancient stone tool.Eighty-nine were flaked-stone tools; the ninetieth was a carefully shaped discoid, perhaps a mano or grinding stone....
- Formal tools are rare but include scrapers, a discoid and two choppers.
- Stone Age tools such as handaxes, cleavers, discoids and scrapers have been discovered in the region.
Derivatives
discoidal
/ adjective ...- The conch is thickly discoidal, with broadly convex sides and rounded venter with rounded ventral shoulders.
- A distinguishing feature of the echinoids is that the ossicles imbricate and are fused into a globular or discoidal test; its flattened or concave oral side faces the substratum and the aboral side is arched in most species.
- All known species of Capisocysta have a spheroidal rather than discoidal shape, and an equatorial flange is never present.
Origin
Late 18th century: from Greek diskoeidēs, from diskos (see discus).