Discoidal

Part of speech: adjective

Definitions

1. Having a shape that is significantly flat and circular Relating to objects that exhibit a disc-like form Characterized by being round and typically two-dimensional in nature
2. Exhibiting a circular shape that is often flat and disk-like Pertaining to structures that resemble a disc in their overall form Defined by having a two-dimensional, circular appearance akin to that of a saucer or disk
3. Having a shape resembling a flat, rounded disk or plate

Etymology: "Discoidal" is a plain adjectival formation: it combines "discoid", meaning disk-shaped, with the suffix "-al", which turns a noun or adjective into one meaning "of, relating to, or having the character of." The result says, in effect, "having the form of a disk" in a slightly more technical register than the everyday word "disk" itself. The base "discoid" is the older and more fundamental piece. It is built from "disc" or "disk" with the suffix "-oid", from Greek "-oeidēs", meaning "resembling" or "having the form of." So "discoid" is literally "disk-like," and "discoidal" adds a further layer of adjectival force on top of that.