The word 'transportable' is built upon the classical Latin verb transportare, which itself is a compound of the prefix trans- ("across") and the verb portare ("to carry"). The core concept of carrying something across a distance was inherited directly into Middle English from Old French. The modern adjective was formed by appending the productive English suffix -able, derived from Latin -abilis, to the verb stem 'transport'. This suffix systematically creates adjectives indicating a passive capacity or fitness, thus logically transforming the action of "carrying across" into the state of being "capable of being carried across."

Structure: trans (across) + port (carry) + able (capable of) - trans: Latin prefix meaning "across, beyond, through." - port: Latin root from portare, meaning "to carry." - able: English suffix from Latin -abilis, forming adjectives meaning "capable of, fit for."