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sub·vis·i·ble | \ ˌsəb-ˈvi-zə-bəl 
\
\variants:
or sub-visible
Definition of subvisible
: not visible without the aid of special instruments
subvisible particles subvisible cirrus clouds For Great Lakes fishermen, the immediate threat is not the thumb-size grown-ups but the subvisible larvae they spawn by the tens of thousands. Off the shores of Toledo and Cleveland and near Leamington, Ont., a single cubic meter of water often contains a half-million mussel larvae.— Geoffrey Cowley
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Time Traveler for subvisible
The first known use of subvisible was in 1862
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