pen·tas \ˈpentəs\noun Etymology: New Latin, irregular from Greek pente five — more at five 1.capitalized: a genus of chiefly African herbs or subshrubs (family Rubiaceae) that are grown as ornamentals especially in mild regions or in greenhouses and have opposite leaves, tubular flowers with a hairy throat, and capsular fruit 2.pluralpentas: any plant of the genus Pentas