The Collaborative International Dictionary
Palmarium
Palmarium \Pal*ma"ri*um\, n.; pl. Palmaria. [NL. See Palmar.] (Zo["o]l.) One of the bifurcations of the brachial plates of a crinoid.
Wiktionary
palmarium
n. (context zoology English) One of the bifurcations of the brachial plates of a crinoid.