shoal
To arrive at a shallow (or less deep) area. / (transitive) To cause a shallowing; to come to a more shallow part of. / To become shallow.
plural of vapour trail
Alternative form of rakehell
(uncountable) A method of spacecraft propulsion (electric propulsion) that provides thrust by heating a (typically non-reactive) fluid. / (countable) A spacecraft that uses such method of propulsion.
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