The word "canalicular" pertains to a small canal or duct. There are several synonyms for this word, including ductal, tubular, tubal, canicular, and canaliferous. Each of these words describes a narrow, channel-like structure that can be found in various biological systems such as the digestive, respiratory, and circulatory systems. These words can also be used to describe man-made structures such as pipelines, drainage systems, and irrigation canals. Overall, knowing these synonyms can be useful for enhancing one's vocabulary and understanding of different fields of science and engineering.