nucleiform
/ˈnjuːklɪɪfɔːm/ /njuːˈkleɪɪfɔːm/adjective
1Having the form of a nucleus or kernel; of a rounded shape. Also (Botany : (especially of the apothecia of certain lichens) globose. Now rare.
2 Archaeol. Designating a type of prehistoric stone tool, usually with a rounded working edge, which resembles a knapped core.
Origin
Mid 19th century; earliest use found in Benjamin Smart (d. 1872), elocutionist and grammarian. From nucleus + -iform.