Biloculate refers to an object or organism that is divided into two compartments, cells or lobes. The antonyms of biloculate would, therefore, refer to objects that are not divided into two compartments or lack the presence of lobes. For instance, an object that is undivided, unilobular, non-articulated, nonsegmental, or non-lobed would be considered an antonym of biloculate. The opposite of biloculate can also be referred to as monolobular, unsegmented, simple, homogeneous or indivisible. In biology, structures that lack lobes, such as flatworms, are considered simple or unlobed, as opposed to bilobed organisms such as insects or segmented worms.