From ZooTerms (Dictionary of Invertebrate Zoology)
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ramus (noun; plural rami; Latin ramus, branch): 1. A branch or outgrowth of a structure.

2. (Annelida) The notopodium and neuropodium that form the two parts of a parapodium; the two rami.

3. (Arthropoda: Crustacea) The flagellum.

4. (Arthropoda: Insecta) a. One of paired structures linking valvulae and valvifers of the eighth and ninth abdominal segments; rami valvularum. b. In Collembola, the distal portions of the corpus.

5. (Rotifera) One of two usually thick, triangular pieces extending from the fulcrum of the mastax.