Tetradelphous is a derived term of adelphy.
In botany|lang=en terms the difference between tetradelphous and adelphy
is that tetradelphous is (botany) having its stamens fused together at least partly by the filaments so that they form four separate groups, some of which may contain a single stamen while adelphy is (botany) fusion of stamen filaments.
As an adjective tetradelphous
is (botany) having its stamens fused together at least partly by the filaments so that they form four separate groups, some of which may contain a single stamen.
As a noun adelphy is
(botany) fusion of stamen filaments.
tetradelphous
English
Adjective
(-)
(botany) Having its stamens fused together at least partly by the filaments so that they form four separate groups, some of which may contain a single stamen.
Usage notes
*Said of either a flower of a plants bearing such flowers. adelphy
English
Noun
(-)
(botany) Fusion of stamen filaments.
Usage notes
* Above five groups of fused stamens, (term) is preceded with the numeral.
Derived terms
* monadelphy, monadelphous
* diadelphy, diadelphous
* triadelphy, triadelphous
* tetradelphy, tetradelphous
* pentadelphy, pentadelphous
* polyadelphy, polyadelphous