
1) Animal in space 2) Morphon s counterpart 3) One-act opera 4) Opera by Étienne Méhul 5) Satellite of the Soviet Union
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https://www.crosswordclues.com/clue/bion
[satellite] == Bion space program == === Bion precursor flights & Bion flights === The Soviet biosatellite program began in 1966 with Kosmos 110, and resumed in 1973 with Kosmos 605. Cooperation in space ventures between the Soviet Union and the United States was initiated in 1971, with the signing of the US/Soviet Science and Applications ...
Found on
http://en.wikipedia.org/wiki/Bion_(satellite)

• (p. pr.) The physiological individual, characterized by definiteness and independence of function, in distinction from the morphological individual or morphon.
Found on
http://thinkexist.com/dictionary/meaning/bion/

minor Greek bucolic poet.
Found on
http://www.britannica.com/eb/a-z/b/67

Bion 4 (Cosmos 936) A series of large Soviet spacecraft, based on the Zenit reconnaissance satellite and designed to study the biological effects of weightlessness and radiation in space. Bion missions were typically given Cosmos designations. The first Bion launch – Cosmos 605 on Oct. 31...
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http://www.daviddarling.info/encyclopedia/B/Bion.html

(lived c. 100 BC) Greek bucolic (pastoral) poet, born near Smyrna, who lived mostly in Sicily. The best of his few surviving poems is `Lament for Adonis`. ...
Found on
http://www.encyclo.co.uk/local/20688

Believe It Or Not
Found on
http://www.encyclo.co.uk/local/21662
Bi'on noun [ Greek
... living,
present participle of
... to live.]
(Biol.) The physiological individual, characterized by definiteness and independence of function, in distinction from the morphological individual or
morphon .
Found on
http://www.encyclo.co.uk/webster/B/54

Type: Term Pronunciation: bī′on Definitions: 1. A living thing.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=10319

Believe it or not.
Found on
http://www.noslang.com/dictionary/b/

bion 1. A living thing; an individual living organism. 2. A living unit including not only cells but also viruses. There is some confusion among biologists who say the term is considered synonymous with `individual” and by others as a variant spelling of biome. There is further confusion in the literature with biont.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2819/21

fl. c100 b.c., Greek pastoral poet.
Found on
https://www.infoplease.com/dictionary/bion
No exact match found.