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Related to trimerous: tetramerous


1. Having three similar segments or parts.
2. Botany Having flower parts, such as petals, sepals, and stamens, in sets of three.

trim′er·y n.


1. (Botany) (of plants) having parts arranged in groups of three
2. (Zoology) consisting of or having three parts


(ˈtrɪm ər əs)

1. (of flowers) having members in each whorl in groups of three.
2. (of arthropods) having three segments or parts.
[1820–30; < New Latin trimerus; see trimer, -ous]
References in periodicals archive ?
The flower of Cyperoideae is tetracyclic with two alternating whorls of three perianth members, one whorl of three stamens opposite the outer perianth parts, and a trimerous gynoecium (Vrijdaghs et al.
As an evolutionary old family the Annonaceae exhibit floral morphological characters which they partly share with other representatives of the order Magnoliales and further basal angiosperms, such as hermaphrodititic flowers, a usually trimerous perianth, and numerous stamens and carpels with a helical arrangement along an elongated, mostly convex receptacle.
id=143&jbid=18 trimerous farce generic zyrtec http://www.
Staminate flower symmetrical, trimerous, from barely to widely open at anthesis; sepals 3 short, [+ or -]triangular, sometimes basally connate; petals 3, much exceeding the sepals, valvate, boat-shaped, straight or reflexed, basally connate; stamens 3-12, anthers small, [+ or -]oval-linear, versatile, latrorse; pistillode present, minute, trifid, or absent.