say it: PLAN-tuhn
plantain is a noun meaning "any of numerous plants of the genus Plantago; mostly small roadside or dooryard weeds with elliptic leaves and small spikes of very small flowers; seeds of some used medicinally". It carries 3 recorded senses.
a banana tree bearing hanging clusters of edible angular greenish starchy fruits; tropics and subtropics
starchy banana-like fruit; eaten (always cooked) as a staple vegetable throughout the tropics
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for plantain come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.