The phrase "arranged in a horizontal" is correct and usable in written English.
It can be used when describing the orientation or layout of objects, text, or images that are positioned side by side rather than stacked vertically.
Example: "The items on the shelf were arranged in a horizontal line, making it easy to see each one clearly."
Alternatives: "set out horizontally" or "aligned in a horizontal manner".
Their flesh is almost gone, leaving rags, boots and bones; their bleached skulls are roughly arranged in a horizontal line.
Or take ruby red dominoes of blue fin tuna, arranged in a horizontal line so straight that a geometry geek with a protractor couldn't have detected any deviation.
Ellsworth Kelly's work only occasionally comes to auction, and last night his "Spectrum VI," a group of 13 single-color canvases arranged in a horizontal row, was on offer.
Experiments conducted are (1) without any forced jet stirring (reference case), (2) four jets arranged in a horizontal circle and (3) aligned jets; they were all in a tank containing water with a known homogeneous initial suspended sediment concentration.
Photographs shown together are arranged in a horizontal line sometimes broken into vertically-juxtaposed equal sequences.
The original scale on paper consists of 6 drawings of faces, arranged in a horizontal row, with a neutral face at the left (scored 0) and the maximum pain face at the right (scored 10).
In order to describe the surface reaction, we need to account for the molecularly rough surface, and to do this, we again suppose that the molecules are arranged in a lattice, with the horizontal layers denoted by an index n, with n = 0 indicating the initial surface, and n increasing with depth into the lattice.
Tubular systems can be found in different orientations; horizontal tubes arranged in a single plane and multiple planes of vertically stacked horizontal tubes (fence-like systems).
The most elaborate drawing here is a phrase arranged in a double-mirroring design (both horizontal and vertical) so that it resembles a beautiful, you might even say heavenly, gate bathed in light.
Note that these figures are arranged in a grid in which the horizontal axis shows the number of edges |E| in the bipartite graph, and the vertical axis shows the number of obstacles in the polygonal map.
Eight loudspeakers were arranged in a circle and spanned the horizontal plane in steps of 45° (Fig. 2A).
