deobstructio

deobstructio [cf. CL obstructio] , clearance (of watercourse) from obstruction. s1327 inquisicio ‥ presentarunt quod ‥ in cursu aque de Nene ‥ obstruccio quedam erat facta ‥, ad quem deobstruendum ‥ abbas cum toto consilio suo ‥ nitebantur [sic] et tandem sumptibus propriis ~onem predictam ‥ obtinuit per decretum Whittlesey Cont. 229.