- primibrachs
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n. pl. [L. primus, first; Gr. brachion, upper arm](ECHINODERMATA: Crinoidea)All brachials of an unbranched arm; there are usually 2, the second of which is an axillary.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
