To close a window (typically by clicking a button marked with an X symbol).
To cross out with a series of the letter X, or with scribbles or lines.
A concept or model.
Something constructed from parts.
A segment of nucleic acid, created artificially, for transplantation into a target cell or tissue.
To draw (a geometric figure) by following precise specifications and using geometric tools and techniques.
To build or form (something) by assembling parts.
To build (a sentence, an argument, etc.) by arranging words or ideas.