spiculum

IPA: spˈɪkjʌɫʌm

A thrusting javelin used by Romans that replaced the pilum in the late 3rd century.
A sharp, pointed crystal, especially of ice.
(zoology) A sharp, needle-like structure, especially those making up the skeleton of a sponge.
(astronomy) A small radial emission of gas seen in the chromosphere and corona of the sun.

Examples of "spiculum" in Sentences

The spiculum tended to have a much shorter iron point.
The spiculum had a medium iron shank attached to the head.
The spiculum fell out of favour with the Roman army some time after 400AD.
The spiculum fell out of favour with the Roman army some time after AD 400.
Stream of emotional, creative impulse strong enough and hot enough to thaw the classical icebergs till not a floating spiculum of them is left.
Rossiter in this autumn of 1917 was extremely interested in certain crucial experiments he was making with spiculum in sponge-cells; with scleroblasts, "mason-cells," osteoblasts, and "consciousness" in bone-cells.
Refining on the more delicate sound of stipes, the Latins got 'stipula,' the thin stem of straw: which rustles and ripples daintily in verse, associated with spica and spiculum, used of the sharp pointed ear of corn, and its fine processes of fairy shafts.
After sundry caresses between the two parties, during which they exhibit an animation quite foreign to them at other times, one of the snails unfolds from the right side of its neck, where the generative orifice is situated, a wide sacculus, which, by becoming everted, displays a sharp dagger-like spiculum, or dart, attached to its walls.