adelpho-, adelph-, -adelphia, -adelphous +

(Greek: brother)

monadelphous
In botany, a reference to stamens having the filaments united so as to form one bundle.
patradelphy
The brother of a father; an uncle on the father’s side.
pentadelphous
In botany, a reference to stamens that are united by the filaments in five bundles; (of a plant) having the stamens so united.
Philadelphia
1. “Brotherly love”.
2. An ancient city of Asia Minor northeast of the Dead Sea in modern-day Jordan. The chief city of the Ammonites, it was enlarged and embellished by Ptolemy II Philadelphus (285-246 B.C.) and named in honor of him. Amman, the capital of Jordan, is now on the site.
3. The largest city of Pennsylvania, in the southeast part of the state on the Delaware River.

It was founded as a Quaker colony by William Penn in 1681 on the site of an earlier Swedish settlement.

The First and Second Continental Congresses (1774 and 1775-1776) and the Constitutional Convention (1787) met in the city, which served as the capital of the United States from 1790 to 1800.

philadelphus
Loving one's brother.
philadelphy
Brotherly love.
Polyadelphia
In botany, plants whose flowers have the stamens united in three or more bundles.
polyadelphous
In botany, having stamens joined by their filaments into a number of clusters.
synadelphus
Conjoined twins with a single head, partially united trunk, and four upper and four lower limbs.
triadelphous
In biology, a reference to stamens that are united by their filaments into three bundles; of a plant having the stamens so united.