subvisible
adjective
\
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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