The Collaborative International Dictionary
Ramulus
Ramulus \Ram"u*lus\ (r[a^]m"[-u]*l[u^]s), n.; pl. Ramuli (r[a^]m"[-u]*l[imac]). (Zo["o]l.) A small branch, or branchlet, of corals, hydroids, and similar organisms.
Wiktionary
ramulus
n. (context zoology English) A small branch, or branchlet, of corals, hydroids, and similar organisms.