| 释义 |
helicoid
 helicoida helicoid generated by rotating and translating a line at a constant rate about an axis to which it is perpendicularhel·i·coid H0130400 (hĕl′ĭ-koid′, hē′lĭ-)adj. Arranged in or having the approximate shape of a flattened coil or spiral.n. Mathematics A surface in the form of a coil or screw.
[Greek helikoeidēs : helix, helik-, spiral; see helix + -oeidēs, -oid.]helicoid (ˈhɛlɪˌkɔɪd) adj (Biology) biology shaped like a spiral: a helicoid shell. n (Mathematics) geometry any surface resembling that of a screw thread ˌheliˈcoidally advhel•i•coid (ˈhɛl ɪˌkɔɪd, ˈhi lɪ-)
adj. 1. coiled or curving like a spiral. n. 2. a warped geometric surface generated by a straight line moving so as to cut or touch a fixed helix. [1690–1700; < Greek helikoeidḗs. See helix, -oid] hel`i•coi′dal, adj. Translationshelicoid
helicoid[′hel·ə‚kȯid] (invertebrate zoology) Of a gastropod shell, shaped like a flat coil or flattened spiral. (mathematics) A surface generated by a curve which is rotated about a straight line and also is translated in the direction of the line at a rate that is a constant multiple of its rate of rotation. helicoid
spiral [spi´ral] 1. winding like the thread of a screw; called also helical.2. a winding structure; see also coil and helix.Curschmann's s's coiled fibrils of mucin sometimes found in the sputum of patients with asthma. See also Laënnec's pearls.hel·i·coid (hel'i-koyd), Resembling a helix. Synonym(s): helical (2) [G. helix, a coil, + eidos, resemblance] hel·i·coid (hel'i-koyd) Resembling a helix.
Synonym(s): helical (2) . [G. helix, a coil, + eidos, resemblance]ThesaurusSeespiral |