n.; pl. -tra [L. rostrum, beak]
1. A beak or snout; see rostellum.
2. (ARTHROPODA: Chelicerata)
The labrum of spiders.
3. (ARTHROPODA: Crustacea)
The median pointed process at the end of the cephalothorax. a. In thoracic barnacles, a valve between the lateral and opposite carina at the basiscutal end of the capitulum; simple and bearing alae in many balanomorphs, but compound and overlapping the laterals in higher balanomorphs; see compound rostrum.
4. (ARTHROPODA: Insecta)
a. In Hemiptera, the beak. b. In Coleoptera scarab beetles, a rigid, ventral extension of the paramere.
Inner elevation of the brachial valve; a pair of club shaped elevations for muscle attachment for the brachial protractor muscles.
6. (MOLLUSCA: Cephalopoda)
a. The anteriormost point of the upper and lower mandibles; see beak b. The spine anchored on the posterior end of a cuttle bone and some pens.
7. (NEMATODA: Secernentea)
In Aphelenchida males, the beak-like projection ventrad near the proximal end of the spicule, joining the dorsal and ventral spicular shafts.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • Rostrum — may refer to:* Australian Rostrum, an association of Australian public speaking clubs * Rostrum (anatomy), an anatomical structure resembling a bird s beak * Rostrum (ship), a form of bow on naval ships * Rostrum of corpus callosum, a commissural …   Wikipedia

  • Rostrum — Ros trum ( tr[u^]m), n.; pl. L. {Rostra}, E. {Rostrums}. [L., beak, ship s beak, fr. rodere, rosum, to gnaw. See {Rodent}.] 1. The beak or head of a ship. [1913 Webster] 2. pl. ({Rostra}) (Rom. Antiq.) The Beaks; the stage or platform in the… …   The Collaborative International Dictionary of English

  • Rostrum — (lat.), 1) Schnabel; 2) (röm. Ant., Rostra), Schiffsschnäbel, die 2 starken, mit eisernen Spitzen versehenen Balken am Vordertheil der Kriegsschiffe, womit man die feindlichen Schiffe in der Seite zu durchbohren suchte, daß sie leck wurden u.… …   Pierer's Universal-Lexikon

  • rostrum — 1540s, from L. rostrum, name of the platform stand for public speakers in the Forum in ancient Rome. It was decorated with the beaks of ships taken in the first naval victory of the Roman republic, over Antium, in 338 B.C.E., and the word s older …   Etymology dictionary

  • rostrum — [räs′trəm] n. pl. rostrums or rostra [ros′trə] [L, beak, in pl., speakers platform (see ROSTRUM 1b) < rosus, pp. of rodere, to gnaw, peck: see RAT] 1. in ancient Rome, a) a curved, beaklike projection at the prow of a ship; esp., such a… …   English World dictionary

  • Rostrum — (lat.), der Schnabel (s. d.), bei vielen Tieren, z. B. den Krebsen, die spitz zulaufende vordere Verlängerung des Kopfes …   Meyers Großes Konversations-Lexikon

  • Rostrum — (lat., »Schnabel«), der am Vorderteil der röm. Kriegsschiffe angebrachte, zur Abwehr und zum Durchbohren feindlicher Schiffe bestimmte, mit Erz beschlagene Schiffsschnabel [Abb. 1544]. Daher Rostra die Rednerbühne auf dem Forum im alten Rom,… …   Kleines Konversations-Lexikon

  • rostrum — ròstrum m DEFINICIJA 1. zool. šiljak na prednjem dijelu rakova oklopa 2. pom. pov. čvrst kljun na antičkim brodovima, njime se probijao neprijateljski brod; embolon ETIMOLOGIJA lat.: kljun …   Hrvatski jezični portal

  • rostrum — ► NOUN (pl. rostra or rostrums) 1) a raised platform on which a person stands to make a public speech, play music, or conduct an orchestra. 2) a platform for supporting a film or television camera. 3) chiefly Zoology a beak like projection.… …   English terms dictionary

  • Rostrum — Als Rostrum (lat. „Rüssel“, „Schnauze“, „Schnabel“) werden in der Anatomie spitz zulaufende oder schnabelartige Verlängerungen oder Fortsätze bezeichnet: bei Wirbeltieren der knöcherne Teil der Schnauze bei Vögeln der Schnabel und die… …   Deutsch Wikipedia

  • rostrum — (1) Anteriorly projecting, unpaired, usually rigid median extension of carapace between eyes or ocular peduncles; (2) anterior beaklike projection of valve margins overhanging incisure or notch (Ostracoda); (3) unpaired anteroventral plate of… …   Crustacea glossary

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