- raceA contest between people, animals, vehicles, etc. where the goal is to be the first to reach some objective.
- radixA root.
- heteroradicalEither of a pair of homonyms that have different roots
- radicicolousThat lives in or on the roots of plants
- radiciflorousFlowering from the root.
- radiciformHaving the nature or appearance of a root (radix).
- radicivorousThat feeds on plant roots.
- radix graministhe root of couch grass, once used medicinally