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imprescriptible (adj.)[imprescriptible 词源字典]: "inalienable, not subject to prescription," 1560s, French imprescriptible (16c.) or a native formation from assimilated form of in- (1) "not, opposite of" + Latin praescriptus, past participle of praescribere "to write beforehand" (see prescribe). Usually with right. Alternative imprescribable is attested from 1887.[imprescriptible etymology, imprescriptible origin, 英语词源]
prescription (n.): late 14c., in law, "the right to something through long use," from Old French prescription (13c.) and directly from Latin praescriptionem (nominative praescriptio) "a writing before, order, direction," noun of action from past participle stem of praescribere "write before, prefix in writing; ordain, determine in advance," from prae "before" (see pre-) + scribere "to write" (see script (n.)). Medical sense of "written directions from a doctor" first recorded 1570s.
prescriptive (adj.): 1748, from Late Latin praescriptivus, from praescript-, past participle stem of praescribere (see prescription). Or formed in English from archaic prescript "a direction" (1530s), from Latin praescriptum.
prescript: "An ordinance, law, or command", Mid 16th century: from Latin praescriptum 'something directed in writing', neuter past participle of praescribere (see prescribe).