Pertaining to or of the nature of an elongated and flexibly unsegmented extension that is used for grasping, moving around, touching and feeling, etc.: Gerhard and the other biologists were studying the tidal pool animals to determine which ones were the most tentacular.

A passage that extends into the elongated, flexible, arm-like extensions of an animal: Some invertebrates have tentacular canals in their tentacles; such as, "jellyfish" which are free-swimming marine animals consisting of umbrella-shaped bodies with trailing tentacles; and it should be noted that these soft-bodied animals are not fish.