spiculum

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.

From Mrs. Warren's Daughter A Story of the Woman's Movement by Sir Harry Hamilton Johnston

Some of the fibres are thickly covered with extremely minute spicula, occasionally aggregated into little tuffs; and hence they have a hairy appearance.

From Volcanic Islands by Charles Darwin

These spicula are of the same diameter throughout their length; they are easily detached, so that the object-glass of the microscope soon becomes scattered over with them.

From Volcanic Islands by Charles Darwin

In some cases I have found spicula projecting from the inner plate of the skull, and pressing upon or even penetrating the dura mater.

From The Dog by William Youatt

As the flakes fall down through the atmosphere, they are joined by more of these radiated spicula, and thus increase in bulk like the drops of rain or hail-stones.

From The Mirror of Literature, Amusement, and Instruction Volume 13, No. 358, February 28, 1829 by Various

I pray you note that for many a day his carpet hath been the spicula of pine, and his atmosphere hath been perfumed by the fir-tree.

From A Breeze from the Woods, 2nd Ed. by William Chauncey Bartlett