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1. or pen·tam·er·al (-əl) Having five similar parts.
2. Having flower parts, such as petals, sepals, and stamens, in sets of five.

pen·tam′er·ism, pen·tam′er·y n.


(Botany) consisting of five parts, esp (of flowers) having the petals, sepals, and other parts arranged in groups of five
penˈtamerˌism, penˈtamery n


(pɛnˈtæm ər əs)

1. consisting of or divided into five parts.
2. (of flowers) having five members in each whorl.
[1820–30; < New Latin pentamerus. See penta-, -merous]
pen•tam′er•ism, pen•tam′er•y, n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.pentamerous - divided into five parts; specifically, having each floral whorl consist of five (or a multiple of five) members; "pentamerous flowers"
phytology, botany - the branch of biology that studies plants
divided - separated into parts or pieces; "opinions are divided"
References in periodicals archive ?
The larva develops four pairs of long arms with a single, continuous ciliary band that is used for swimming and feeding (Strathmann, 1971, 1975, 1978); and pentamerous juvenile structures develop within the bilateral ophiopluteus (Hyman, 1955; Burke, 1989; Hendler, 1991).
Corolla pentamerous, gamopetalous and caducous, with valvate aestivation, presumably rotate and reflexed.
Flowers are small, tetra or pentamerous and white to pink or purple.
In total, 38 specimens have been seen and three of them (7.9%) have clearly visible additional anchors and tentacle groups, matched with additional rows of gonads, giving perfect pentamerous, hexamerous and octamerous symmetry.
Shoot Out's dam, the winning Pentamerous, is also the dam of 1m4f New Zealand Group 3 winner Cassandra Show (by Johannesburg) and is a half-sister to Group 2-winning miler St Hilarion.
The flowers present white to yellowish-white color, they are small, arranged in large terminal corymbs summits morphologically monoclinic or tetramer pentamerous, and actinomorphic (NUNES et al., 2007).
rosa-sinensis belongs to the family, Malvaceae, the roots are cylindrical, the leaves are simple ovate or 0vatelanceolate, the flowers are pedicillate, actinomorphic, pentamerous and complete.