subsonic speed ( synonym found)
Definition of subsonic speed:

°A type of lettering form written lower than the things around it.
"In chemical formulas the number of atoms in a molecule is written as a subscript, so we write H2O for water which has two atoms of hydrogen for each one of oxygen."
°(computing) A numerical index into an array.
Definition of subsonic speed:

°A type of lettering form written lower than the things around it.
"In chemical formulas the number of atoms in a molecule is written as a subscript, so we write H2O for water which has two atoms of hydrogen for each one of oxygen."
°(computing) A numerical index into an array.
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