Relating to or having ten stamens; describing a flower with ten male reproductive organs.
From deca- (ten) + -androus (from Greek andr-, male). Adjectival form of the botanical classification.
If you're looking at a decandrous flower like a peach blossom, you'd count exactly 10 stamens—making the word a quick way botanists say 'ten male parts' without the awkwardness.
Complete word intelligence in one call. Free tier — 50 lookups/day.