involucrum
(physics, chemistry) The property of certain photochromic materials of colouring in near-ultraviolet light and then fading in its absence; they are used in the lenses of sunglasses
A sheath that covers or envelopes, especially one that forms around the sequestrum of new bone. / (botany) An involucre.
(transitive) To supply (something) with staff or crew (of either sex). / (transitive) To take up position in order to operate (something).
Pronunciation spelling of by-and-by.
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