| siphonium | Origin: NL, from Gr, dim. Of. See Siphon. <anatomy, ornithology> A bony tube which, in some birds, connects the tympanium with the air chambers of the articular piece of the mandible. Source: Websters Dictionary (01 Mar 1998) |
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| siphonobranchiata | <zoology> A tribe of gastropods having the mantle border, on one or both sides, prolonged in the form of a spout through which water enters the gill cavity. The shell itself is not always siphonostomatous in this group. Origin: NL. See Siphon, and Branchia. Source: Websters Dictionary (01 Mar 1998) |
| siphonobranchiate | <zoology> Having a siphon, or siphons, to convey water to the gills; belonging or pertaining to the Siphonobranchiata. One of the Siphonobranchiata. Source: Websters Dictionary (01 Mar 1998) |
| siphonoglyphe | <zoology> A gonidium. Origin: Siphon + Gr. To engrave. Source: Websters Dictionary (01 Mar 1998) |
| siphonophora | <zoology> An order of pelagic Hydrozoa including species which form complex free-swimming communities composed of numerous zooids of various kinds, some of which act as floats or as swimming organs, others as feeding or nutritive zooids, and others as reproductive zooids. Origin: NL, fr. Gr. A siphon + to bear. Source: Websters Dictionary (01 Mar 1998) |
| siphonophoran | <zoology> Belonging to the Siphonophora. One of the Siphonophora. Source: Websters Dictionary (01 Mar 1998) |
| siphonophore | <zoology> One of the Siphonophora. Source: Websters Dictionary (01 Mar 1998) |
| siphonopoda | <zoology> A division of Scaphopoda including those in which the foot terminates in a circular disk. Origin: NL. See Siphon, and -poda. Source: Websters Dictionary (01 Mar 1998) |
| siphonostomata | <zoology> A tribe of parasitic copepod Crustacea including a large number of species that are parasites of fishes, as the lerneans. They have a mouth adapted to suck blood. An artificial division of gastropods including those that have siphonostomatous shells. Origin: NL. See Siphon, and Stoma. Source: Websters Dictionary (01 Mar 1998) |
| siphonostomatous | <zoology> Having the front edge of the aperture of the shell prolonged in the shape of a channel for the protection of the siphon; said of certain gastropods. Pertaining to the Siphonostomata. Source: Websters Dictionary (01 Mar 1998) |
| siphonostome | <zoology> Any parasitic entomostracan of the tribe Siphonostomata. A siphonostomatous shell. Origin: Gr. A siphon + mouth. Source: Websters Dictionary (01 Mar 1998) |
| siphorhinal | <zoology> Having tubular nostrils, as the petrels. Origin: Siphon + rhinal. Source: Websters Dictionary (01 Mar 1998) |
| siphorhinian | <zoology> A siphorhinal bird. Source: Websters Dictionary (01 Mar 1998) |
| siphoviridae | A family of bacteriophages which are characterised by long, non-contractile tails. (12 Dec 1998) |
| siphuncle | <zoology> The tube which runs through the partitions of chambered cephalopod shells. Origin: L. Siphunculus, sipunculus, dim. Of sipho. See Siphon. Source: Websters Dictionary (01 Mar 1998) |