Helicoidal is an adjective that describes something that is spiral or twisted in shape. There are different words that can be used as synonyms for helicoidal, such as spiral, coiled, twisted, corkscrew, screw-like, and spiraled. All of these words indicate that something has a twisting or winding shape, which can be seen in a variety of natural and man-made things, such as DNA strands, spiral stairs, coiled wires, twisted ropes, corkscrew curls, and screw-shaped objects. Using these synonyms can help add descriptive flavor to writing and communication, while also offering more precise language.