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

- The operculum (from Latin operculum 'cover, covering'; pl. opercula or operculums) is a corneous or calcareous anatomical structure like a trapdoor that...
- The operculum is a series of bones found in bony fish and chimaeras that serves as a facial support structure and a protective covering for the gills;...
- 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...
- A spiral valve or scroll valve is the cork****-shaped lower portion of the intestine of some sharks, Acipenseriformes (sturgeon and paddlefish), rays...
- 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...
- cannot be retracted within it (semi-slug). Some snails also possess an operculum that seals the opening of the s****, known as the aperture, which provides...
- 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...
- The operculum papillare is the iris found in the eyes of elasmobranchs (skates, sharks and rays). It can undergo pupillary light reflex to such an extent...
- refer to the two chromatically hued spiral structures, the most common feature seen by divers. The multicolored spirals are highly derived structures for...
- Ammonoids are extinct spiral s****ed cephalopods comprising the subclass Ammonoidea. They are more closely related to living coleoids (i.e., octopuses...