The word is a modern English compound adjective formed by combining the noun "tube," which entered English via French from the Latin 'tubus' (meaning a pipe or hollow cylinder), with the adjectival suffix "-like," descended from the Old English noun 'līc' (body, form). The suffix '-like' is highly productive in English, attaching to nouns to create descriptive terms indicating resemblance. The logic is transparent: "tube-like" literally means "having the form or characteristics of a tube," directly describing an object's shape. This compounding pattern follows a straightforward Germanic model of descriptive word formation, where a concrete object is paired with a suffix denoting similarity to create a new adjective.

Structure: tube (noun) + like (adjective-forming suffix) - tube: From Latin 'tubus' (pipe, tube). The noun root denoting a long, hollow cylinder. - like: From Old English 'līc' (body, form). A suffix meaning "having the form or characteristics of; similar to".