Final answer:
A sculptured ornament suspended from a roof or ceiling is indeed referred to as a "drop", which is true. Pendentives are the curved triangular structures supporting a dome, while flying buttresses are used in Gothic architecture to support vaults and allow for more window space.
Step-by-step explanation:
A sculptured ornament suspended from a roof truss, vault, or ceiling can often be referred to as a "boss" or a "pendant" in architectural terminology. It is true that such an element is also called a "drop". These features are prominent in various styles of architecture, particularly in Gothic architecture where they contribute to the ornateness and grandeur of vaulted ceilings.
The term pendentive refers to a structural feature that allows for the placement of a circular dome over a square room or an irregular space. It derives from the Latin pendēre, meaning "to hang", indicating its function to support the weight of a dome. The pendentives are typically curved triangular sections that transition the space between a round dome and the supporting piers or columns beneath.
In Gothic architecture, an element known as a flying buttress is used to transfer the load of the roof vaults to external supports, thus allowing for higher walls and more windows. This engineering innovation was crucial in creating the classic Gothic cathedral skyline.