• (n.) The inflorescence of a compound flower in which many florets are gathered into a involucrate head.
An·tho'di·um noun [ New Latin , from Greek ... like flowers, flowery; 
anthodium The inflorescence of a compound flower in which many florets are gathered into a involucrate head. Involucrate refers to a series of bracts beneath or around a flower or flower cluster.
a flower head or capitulum, esp. the head of a composite plant. See illus. under