Origin of tetrameroustetra- + -merous
- Having or consisting of four similar parts.
- Having flower parts, such as sepals, petals, and stamens, in sets of four.
- (botany) in four parts: in a flower each whorl (of flower parts) has four flower parts.
- As the name suggests the crucifers have tetramerous flowers.
From tetra- +"Ž -merous.