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tetragenous. In DICTIOUS you will not only get to know all the dictionary meanings for the word
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English
Etymology
From tetra- + -genous.
Adjective
tetragenous (not comparable)
- (botany, zoology) Involving groups of four; arranged in fours.
2006, Anil Kumar, Botany for Degree Pteridophyta, page 184:The leaves are arranged in four longitudinal rows along the stem. There are two rows of smaller leaves attached to the upper side of stem and two rows of larger leaves attached laterally. The strobili are tetragenous (four-angled) […]
2010, James H. Thorp, Alan P. Covich, Ecology and Classification of North American Freshwater Invertebrates:Mussels that employ all four demibranchs for brooding are referred to as tetragenous.
2012, G. Bauer, K. Wächtler, Ecology and Evolution of the Freshwater Mussels Unionoida, page 234:Eggs are incubated in all four gills (tetragenous). In the other groups the gill structure is stabilized by increasing the number of connectives and by organizing them into continuous walls (Kat 1984).