Where does “racemosus” come from?

racemosus (Latin) comes from Latin -ōsus, from Old Latin -ōssus.

Ancestry of “racemosus”, step by step

Step	Language	Word	Meaning
1	Latin	-ōsus	—
2	Old Latin	-ōssus	—

racemosus — Etymology, Origin & Word History | Etymology Explorer