Acerata
plural noun
Ac·er·a·ta
ˌāsəˈrätə,
ˌas-,
-rā-
in old classifications
: a class of arthropods comprising the Merostomata and Arachnida
Word History
Etymology
New Latin, from Greek akeratos without horns, from a- a- entry 2 + kerat-, keras horn
First Known Use
1866, in the meaning defined above