on or about

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on or about,

adv a phrase used in stating the date of an occurrence or conveyance to avoid being bound by the statement of an exact or certain date.
n a genus of elongated filariform nematodes that inhabit the connective tissue of their hosts, usually within firm nodules in which these parasites are coiled and entangled.
O. volvulus,
n the blinding nodular nematode that causes dermatologic lesions and ocular complications that lead to blindness.