Definition of rectiserial in US English:

rectiserial

adjective

Botany
rare
  • Designating forms of phyllotaxis in which the leaf completing one complete turn of a spiral or whorl lies directly over the first leaf.

Origin

Mid 19th century; earliest use found in Edwin Lankester (1814–1874), public health reformer and natural historian. From recti- + serial, after French rectisérié.

Pronunciation

rectiserial

/ˌrɛktɪˈsɪərɪəl/