Decussately is an uncommon word that is primarily used in botanical terminology. It refers to an arrangement of leaves, branches, or veins that cross each other at right angles. Some synonyms for this term include "crosswise," "diagonally," and "intersecting." Other synonyms that are more specific to botanical language include "opposite," "whorled," and "alternate." These words all describe different patterns of leaf or branch placement that can be seen in various plants and trees. While decussately is most often used in the context of botany, the use of synonyms can help to make this concept more accessible and understandable to a wider audience.