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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 ?
Most of the species of Zinowiewia are large (> 20 m tall) trees sometimes with buttressed trunks, and have minute pentamerous flowers arranged in dichasial cymes (Figs.
Approximately 15 days after fertilization, settlers have more pronounced pentamerous symmetry, the abactinal and actinal regions become distinct, the dorsal spines become more developed (most numerous in the margins), and the eyespot is fully formed (Fig.
Corolla pentamerous, gamopetalous and caducous, with valvate aestivation, presumably rotate and reflexed.
Flowers are small, tetra or pentamerous and white to pink or purple.
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.
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.