superextensile

As a noun terms

is .

As an adjective superextensile is

(biology) describing the feet of some molluscs that can be extended to form burrows.

As adjectives the difference between superextensive and superextensile

is that superextensive is very extensive of vast extensiveness while superextensile is (biology) describing the feet of some molluscs that can be extended to form burrows.

As adjectives the difference between extended and superextensile

is that extended is longer in length or extension; elongated while superextensile is describing the feet of some molluscs that can be extended to form burrows.

As a verb extended

is past tense of extend.

As a noun mollusc

is a soft-bodied invertebrate of the phylum mollusca, typically with a hard shell of one or more pieces.

As an adjective superextensile is

(biology) describing the feet of some molluscs that can be extended to form burrows.

As a noun feet

is (foot).

As an adjective superextensile is

(biology) describing the feet of some molluscs that can be extended to form burrows.