A minute, slender granule, or point.
Any small calcareous or siliceous body found in the tissues of various invertebrate animals, especially in sponges and in most Alcyonaria.
A structural component of the chromosphere that erupts like a plasma geyser driven by dense magnetic fields. Spicules rise between 3,000 and 10,000 kilometers above the magnetic mesh beneath. At the boundary between the photosphere and chromosphere, spicules look like peach fuzz. Spicules live short, dynamic lives of a few minutes but spew plasma at speeds of more than ten kilometers a second.
n. (L. spicula, a small spike) a small, slender, sharp-pointed piece, usually on a surface; a small spike of flowers.
Spicules are very bright spikes that extend from the Sun into the chromosphere.
glass-like supporting needle or rod found in tissue.
a small, slender, pointed structure or crystal in the skeleton of sponges, corals and the like.
tiny siliceous or calcareous needle-like support element of most sponges.
spiculum = a dart; a hard, needle-like structure, e.g., spicules of bone in cancellous bone (most spicules are lamellae).
Hard, needle-shaped, calcium carbonate skeletal structure contained within soft corals. Also known as a sclerite. Search for more information...
the minute calcareous or siliceous skeletal bodies found in sponges (Phylum Porifera), radiolarians (a protist group), soft corals (Phylum Cnidaria), and sea cucumbers (Phylum Echinodermata).
small spikeline protrusion arising within the chromosphere.
small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals
A predominantly vertical structure extending from the solar chromosphere into the corona, observed in Hydrogen-Alpha. Spicules are concentrated on the boundaries of super-granulation cells, have lifetimes of 5 to 10 minutes, and are about 1000 km across and 10,000 km long.
A jet of rising material in the solar chromosphere.
n. A needlelike structure made of silica or calcium carbonate that, in large numbers, makes up the supporting framework of various sponges.
One of the minute, usually hard, calcareous or siliceous bodies that support the soft tissue of various invertebrates.
a small spike or needle shaped body, often bone.
A short-lived spike-like solar prominence.
a small, slender, hard body, sharp-pointed, often needle-like, as the spciulose fringe on the girdle of a chiton.
is a spine like feature of the test, formed by the fusion of inner siliceous bars and beams
spicules are sharp spikes (made of calcium carbonate) located in the mesohyl. Spicules form the "skeleton" of many sponges.
a small calcareous or siliceous body found in the tissues of various plants and invertebrate animals, especially in sponges.
Crystalline or mineral deposits found in sponges, sea cucumbers, or urochordates. They are structural components in many sponges, and may serve a protective function in other organisms.
A short-lived jet or spike of gas that regularly expels particles of matter from near the surface of the Sun.
A small pointed needle-like part on the stem of some plants.