conoid

1. A cone-shaped structure. 2. Part of the apical complex characteristic of the protozoan subphylum, Apicomplexa; seen in sporozoites, merozoites, or other developmental stages of sporozoans, less well developed in the piroplasms (families Babesiidae and Theileriidae). The function of the c. is unknown, but it is thought to be an organelle of penetration into the host cell, possibly aided by a protrusible form of the c.. [G. konoeides, cone-shaped]
- Sturm c. in optics, the pattern of rays formed after passage through a spherocylindrical combination.

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co·noid 'kō-.nȯid or co·noi·dal kō-'nȯid-əl adj shaped like or nearly like a cone
conoid n a cone-shaped structure esp a hollow organelle shaped like a truncated cone that occurs at the anterior end of the organism in some developmental stages of some sporozoans (as of the genus Sarcocystis)

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co·noid (koґnoid) [cono- + -oid] 1. resembling or shaped like a cone. 2. an electron-dense, protrusible, hollow region surrounded by polar rings and composed of spirally coiled microtubules that forms part of the apical complex of apicocomplexan protozoa.

Medical dictionary. 2011.

Look at other dictionaries:

  • conoid — CONOÍD, Ă, conoizi, de, adj., s.n. (mat.) 1. adj. Conoidal. 2. Suprafaţă generată de o dreaptă care se menţine paralelă cu un plan dat şi se sprijină pe o dreaptă fixă şi pe o curbă fixă. – Din fr. conoïde. Trimis de LauraGellner, 30.07.2004.… …   Dicționar Român

  • Conoid — Co noid (k[=o] noid), n. [Gr. kwnoeidh s conical; kw^nos cone + e i^dos form: cf. F. cono[ i]de.] 1. Anything that has a form resembling that of a cone. [1913 Webster] 2. (Geom.) (a) A solid formed by the revolution of a conic section about its… …   The Collaborative International Dictionary of English

  • Conoid — Co noid a. Resembling a cone; conoidal. [1913 Webster] …   The Collaborative International Dictionary of English

  • Conoīd — (Conoides, Math.), Körper, der durch Umdrehung einer krummen Linie um eine Achse entsteht, wenn die Linie diese Achse schneidet u. ihre auf der Achse senkrechten Ordinaten mit ihrem Abstande von jenem Schneidungspunkte immerfort zunehmen. Der… …   Pierer's Universal-Lexikon

  • Conoïd — Conoïd, in der Mathematik ein durch Umdrehung des Kegelschnitts um seine Axe gebildeter Körper …   Herders Conversations-Lexikon

  • conoid — [kō′noid΄] adj. [Gr kōnoeidēs: see CONE & OID] cone shaped: also conoidal n. 1. a cone shaped thing 2. Geom. a solid described by a conic section revolving about its axis …   English World dictionary

  • Conoid — The hyperbolic paraboloid z=xy is a conoid with x axis as its axis. The hyperbolic paraboloid z=xy is a conoid with y axis as its axis. In …   Wikipedia

  • conoid — or conoidal adjective Date: 1570 shaped like or nearly like a cone < conoid shells > < conoid pottery > • conoid noun …   New Collegiate Dictionary

  • conoid — [ kəʊnɔɪd] adjective (also conoidal) chiefly Zoology approximately conical in shape. noun a conoid object …   English new terms dictionary

  • conoid — adj. [Gr. konos, cone; eidos, form] Having the form of a cone; conoidal; see cyrtoconoid, coeloconoid …   Dictionary of invertebrate zoology

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