biramous

/bahy-rey-muhs/US // baɪˈreɪ məs //UK // (ˈbɪrəməs) //

桦树,桦木,桦树状,桦树型

Definitions

adj.形容词 adjective

1
Biology.
- : consisting of or divided into two branches: a biramous appendage.

The name, meaning "cleft-footed," applies to the appendages of the thorax, which are once-branched (biramous).
The sixth segment of the abdomen has a pair of biramous appendages, which, with the telson, form a swimming-fan.
There are always six pairs; each biramous and multiarticulated, supported on a pedicel formed of two segments.
At the end of the last thoracic segment, there is a minute abdomen, bearing three pairs of biramous cirri.
There are four pairs of biramous cephalic appendages, which differ only very slightly from the appendages of the thorax.