A flower in which the parts are arranged in twos is called dimerous; when the parts of the whorls are three, four or five, the flower is trimerous, tetramerous or pentamerous, respectively.
The wounded crept together in twos and threes and one could hear their distressing screams and groans, sometimes feigned--or so it seemed to Rostov.
The officers, as usual, lived in twos and threes in the roofless, half- ruined houses.
