The tail of a dove (family Columbidae); also, something having the shape of a dove's tail.

(chiefly woodworking, often attributively) A noun "dovetail" represents a type of joint where adjoining components are fastened by multiple tenons cut into wedge shapes resembling a dove's tail, which interlock with mortises having corresponding shapes.

(heraldry) A line resembling a dovetail joint (sense 2.1).

(transitive) To unite components with a dovetail joint in woodworking or to combine and fit things together well in a figurative sense.

(intransitive, figurative) Of several things: to combine or fit together well.