Definition of Spiral operculum. Meaning of Spiral operculum. Synonyms of Spiral operculum

Here you will find one or more explanations in English for the word Spiral operculum. Also in the bottom left of the page several parts of wikipedia pages related to the word Spiral operculum and, of course, Spiral operculum synonyms and on the right images related to the word Spiral operculum.

Definition of Spiral operculum

Spiral operculum
Spiral Spi"ral, a. [Cf. F. spiral. See Spire a winding line.] 1. Winding or circling round a center or pole and gradually receding from it; as, the spiral curve of a watch spring. 2. Winding round a cylinder or imaginary axis, and at the same time rising or advancing forward; winding like the thread of a screw; helical. 3. (Geom.) Of or pertaining to a spiral; like a spiral. Spiral gear, or Spiral wheel (Mach.), a gear resembling in general a spur gear, but having its teeth cut at an angle with its axis, or so that they form small portions of screws or spirals. Spiral gearing, a kind of gearing sometimes used in light machinery, in which spiral gears, instead of bevel gears, are used to transmit motion between shafts that are not parallel. Spiral operculum, an operculum whih has spiral lines of growth. Spiral shell, any shell in which the whorls form a spiral or helix. Spiral spring. See the Note under Spring, n., 4.

Meaning of Spiral operculum from wikipedia

- modification of the articulated operculum in which the spiral is not so evident as in Navicella Example of a concentric operculum (Filopaludina martensi) Example...
- When an opposing tooth bites into the operculum, it can initiate or exacerbate pericoronitis resulting in a spiraling cycle of inflammation and trauma. Over-eruption...
- The spiral hornsnail, scientific name Pleurocera brumbyi, is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family...
- nucleus measures one-third the distance across the face. The operculum itself bears a deep, spiral groove and is also granular on the convex outer surface...
- support the fin with lepidotrichia (bone fin rays). They also have an operculum, which helps them breathe without having to swim. Bony fish have no placoid...
- main conical s**** (previously referred to as a ‘conch’) and a cap-like operculum. Some also had two curved supports known as helens They are calcareous...
- refer to the two chromatically hued spiral structures, the most common feature seen by divers. The multicolored spirals are highly derived structures for...
- "common tower s****" is a species of medium-sized sea snails with an operculum, marine gastropod mollusks in the family Turritellidae. This species occurs...
- There has been little published on this species. This species has a green operculum. The size of the s**** varies between 35 mm and 70 mm. The depressed,...
- with oil glands, and sepals and petals that are fused to form a "cap" or operculum over the stamens. The fruit is a woody capsule commonly referred to as...
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