actinotrichium
noun
ac·ti·no·trich·i·um
| \ ¦ak-tə-(ˌ)nō-ˈtri-kē-əm\
variants:
or less commonly actinotrich \ ak-ˈti-nə-ˌtrik \
plural actinotrichia\ ¦ak-tə-(ˌ)nō-ˈtri-kē-ə \
also actinotrichs\ ak-ˈti-nə-ˌtriks \
Definition of actinotrichium
: any of the hairy threadlike fibers in the fin fold of an embryo fish which fuse and form the base of the rays
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