The word 隐形 is formed by combining two meaningful characters into a single conceptual unit. The first character, 隐 (yǐn), carries the core idea of "hiding", "concealing", or "remaining latent". It is directly joined with the second character, 形 (xíng), which means "form", "shape", or "appearance". Their combination does not merely add their meanings, but fuses them to create the new, compound concept of a "concealed form", that is, something that is invisible, stealthy, or imperceptible to sight, as if its very shape has been hidden.