Unibranchiate is a scientific term that refers to an animal that has a single branch or appendage. It is often used in reference to certain marine creatures such as sea anemones or jellyfish. However, if you are looking for synonyms for this term, you could use words like monobranchial, single-branched, one-armed, or uni-appendaged. Other options may include those like unipod, monopodial or single-lobed. By using these synonyms, you can more easily describe the features and traits of these specific organisms with scientific accuracy.