achene
noun
ə-ˈkēn 
: a small dry indehiscent one-seeded fruit (as of a sunflower) developing from a simple ovary and usually having a thin pericarp attached to the seed at only one point
Example Sentences
Recent Examples on the Web Think of the seeds (achenes) on the outside of a berry. 
Ellen Nibali, baltimoresun.com, 27 June 2019 Think of the seeds (achenes) on the outside of a berry. Ellen Nibali, baltimoresun.com, 27 June 2019
Ellen Nibali, baltimoresun.com, 27 June 2019 Think of the seeds (achenes) on the outside of a berry. Ellen Nibali, baltimoresun.com, 27 June 2019 Word History
Etymology
borrowed from French achène, akène, borrowed from New Latin achena, from a- a- entry 2 + -chena, feminine noun derivative from the stem of Greek chaínein "to yawn, gape" — more at yawn entry 1
First Known Use
1855, in the meaning defined above