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pl. [NL., ta (the typical genus) + -ida.] A family of holothurians, named by J. E. Gray in 1840 from the ge nus Pentact a. They are among the holothurians called sea-cucumbers and IMG:content-2640.jpg:[graphic][merged small] sometimes sea - melons. pentactinal (pen-tak'tinal), a. [ from Heteractinida. frondosa. [ pentacle pentacular (pen-tak'ū-lär), a. (ML. as if pentaculum ) + -ars.] Formed into or like a pentacle; having the figure or character of a pentacle: as, a pentacular symbol, emblem, or talisman.