Jacob's thigh was disabled by the Angel, to show the patriarch that his prevalence was through his faith and prayer, not through force, Genesis 32:25-31. Smiting the thigh was a gesture of self-condemnation and grief, Jeremiah 31:19 Ezekiel 21:12.
In general, a datum is a base elevation used as a reference from which to reckon heights or depths. A tidal datum is a standard elevation defined by a certain phase of the tide.
Definition of datum. 1  1 plural dataplay \-É\ : something given or admitted especially as a basis for reasoning or inference an important historical datum This enormous expenseâand considerable riskâto pick up a datum or two about geriatrics? â Charles Krauthammer.