heterodromous

from The Century Dictionary.

• Running or lying in different directions, as leaves on the stem and branches.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Bot.) Having spirals of changing direction.
• adjective (Mech.) Moving in opposite directions; -- said of a lever, pulley, etc., in which the resistance and the actuating force are on opposite sides of the fulcrum or axis.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of levers, in which the power and weight move in opposite directions
• adjective botany Spiralling in opposite directions on a stem or branch