Mid 18th century; earliest use found in John Hill (bap. 1714, d. 1775), physician and actor. From classical Latin racēmōsus characterized by abundant clusters; compare -ous.
Definition of racemous in US English:
racemous
adjectiveˈrasɪməs
1Botany= "racemose".
2Anatomy, Zoology, and Medicine= "racemose".
Origin
Mid 18th century; earliest use found in John Hill (bap. 1714, d. 1775), physician and actor. From classical Latin racēmōsus characterized by abundant clusters; compare -ous.