(printing, historical) A word under the right-hand side of the last line on a book page that repeats the first word on the following page.

(architecture) a bridge in which the horizontal deck is suspended from a reverse catenary to counteract bending

A repeated expression, often originating in popular culture. / A signature phrase of a particular person or group.

(chemistry) A process in which the rate of a reaction in a heterogeneous two-phase system is enhanced by the addition of a substance that transfers one of the reactants across the interface between the two phases.

(hydrology) A topographic region in which all water drains to a common outlet.

(often attributive) Any structure or land feature which catches and holds water; the collection of such water. / A catchment area, or the people it serves.

To divide into catchment areas.

A member of a Native American people who inhabit the Carolinas: the Iswa. / (plural "Catawbas") A reddish American dessert grape.

The now-extinct language of this people.

To give oral instruction, especially of religion; (specifically) by the formal question-and-answer method; in the Church of England and Roman Catholic Church, to teach the catechism as preparation for confirmation.