spiculum

Meanings

1. 1
   noun

   biology: a small sharp needle-like structure, especially a skeletal element of a sponge or other invertebrate

   Each siliceous spiculum helps support the sponge's soft body.

2. 2
   noun

   a small pointed crystal, especially a needle of ice

   A frozen spiculum glittered in the cloud of windblown snow.

3. 3
   noun

   historical: a thrusting javelin used by soldiers of the late Roman Empire

   The infantryman carried a spiculum in place of the older pilum.

Borrowed from Latin spiculum, 'small sharp point or dart,' a diminutive related to spica, 'point or spike.' Scientific and meteorological senses preserve the pointed shape, while late Roman military use named a javelin.

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