Some stems are so narrow as to be threadlike, as in many tropical epiphytic ferns.
The marsh treader, about 8 mm (0.3 inch) long, is recognized by its sticklike body and long, thin, threadlike legs.
Electron-optical observations indicate that imogolite has a unique morphological feature of smooth and curved threadlike tubes varying in diameter from 10 to 30 nanometres (3.9 × 10−7 to 1.2 × 10−6 inches) and extending several micrometres in length.
The number of modified gibbsite units therefore determines the diameter of the threadlike tubes.
Their name refers to their pectoral fins, each of which is divided into an upper, normally shaped fin and a lower section consisting of four to seven long, threadlike rays that serve as sensory devices; they are especially long in the young.
Torpedoes, which can exceed 50 knots, either home onto their targets acoustically with self-contained sonar or are guided by electronic commands passed to them through a threadlike wire paid out behind the speeding projectile.
If the fecal matter reaches suitable soil, the eggs are hatched, and the infective, threadlike larvae may penetrate human skin, usually that of the foot, by way of the sweat glands and hair follicles.
Hair, in mammals, the characteristic threadlike outgrowths of the outer layer of the skin (epidermis) that form an animal's coat, or pelage.
A soredium, consisting of one or several algal cells enveloped by threadlike fungal filaments, or hyphae, may develop into a thallus under suitable conditions.
A tendril is a slender whiplike or threadlike strand, produced usually from the node of a stem, by which a vine or other plant may climb.
Two extremes in shape include the closely folded structure of the globular proteins and the elongated, unidimensional structure of the threadlike fibrous proteins; both were recognized many years before the technique of X-ray diffraction was developed.
