A hair-like or bristle-like structure with a ray-like appearance, found in some microscopic organisms or as a specialized cellular structure.
From Greek 'aktis' (ray) + 'thrix' (hair). Used in microscopy and microbiology to describe fine, radiating filamentous structures.
Some bacteria and protozoans have actinotrichium structures—essentially ray-shaped hairs—that help them move through water or sense their environment, and they're too small to see without powerful magnification but absolutely fascinating under an electron microscope!
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