pentadactylyn.
/ˌpɛntəˈdaktᵻli/, /ˌpɛntəˈdaktl̩i/, U.S. /ˌpɛn(t)əˈdæktəli/ Zoology.
The state or condition of being pentadactyl; = pentadactylism n. at pentadactyl adj. and n.2 Derivatives.
ΘΚΠ
the world > life > the body > external parts of body > limb > digit > [noun] > having specific number of
sexdigitism1775
polydactylism1865
pentadactylism1879
polydactyly1886
tetradactylity1891
pentadactyly1892
1892 E. R. Lankester tr. E. Haeckel Hist. Creation (new ed.) II. xxv. 293 (heading) The five fingers (pentadactyly) of the..Amphibia and Amniota... Their origin from the Polydactyl Fish-fins.
1989 Nature 14 Dec. 738/1 Pentadactyly is not a primitive feature of tetrapods, but a derived character that became established later on, after a period of evolutionary experimentation.
2001 Jrnl. Theoret. Biol. 209 493/1 Palentological [sic] evidence has suggested that pentadactyly has occurred twice during tetrapod evolution.
This is a new entry (OED Third Edition, September 2005; most recently modified version published online March 2022).
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n.1892