ʻoka kilika
n. The silky or silver oak (Grevillea robusta), a large tree from Australia, used for reforesting in Hawaiʻi. The leaves are subdivided like some ferns; the orange flowers are abundant in early summer. (Neal 320–1.) Lit., silk oak. Eng. Also haʻikū keʻokeʻo and on Niʻihau, ʻoka.