| helix | | |
| n. (shape) | 1. helix, spiral | a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle. |
| ~ curve, curved shape | the trace of a point whose direction of motion changes. |
| ~ double helix | a pair of parallel helices intertwined about a common axis.; "the shape of the DNA molecule is a double helix" |
| n. (artifact) | 2. coil, helix, spiral, volute, whorl | a structure consisting of something wound in a continuous series of loops.; "a coil of rope" |
| ~ hank | a coil of rope or wool or yarn. |
| ~ structure, construction | a thing constructed; a complex entity constructed of many parts.; "the structure consisted of a series of arches"; "she wore her hair in an amazing construction of whirls and ribbons" |
| n. (animal) | 3. genus helix, helix | type genus of the family Helicidae. |
| ~ mollusk genus | a genus of mollusks. |
| ~ family helicidae, helicidae | land snails including the common edible snail and some pests. |
| ~ edible snail, helix pomatia | one of the chief edible snails. |
| ~ garden snail | any of several inedible snails of the genus Helix; often destructive pests. |
| ~ brown snail, helix aspersa | serious garden pest having a brown shell with paler zigzag markings; nearly cosmopolitan in distribution. |
| ~ helix hortensis | a kind of garden snail. |
| midrib | | |
| n. (plant) | 1. midrib, midvein | the vein in the center of a leaf. |
| ~ nervure, vein | any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ. |
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