(botany) Either of the plant Echinochloa stagnina or Vossia cuspidata

(slang) A pit bull terrier.

(comical) happy birthday to you

plural of hipposiderid

(zoology) Any of the family Hipposideridae of Old World leaf-nosed bats.

plural of hipposaurid

(zoology) Any therapsid in the family Hipposauridae.

(organic chemistry) A red quinoid carboxylic acid 3-carboxymethyl-5-hydroxy-1,4,8-trioxo-4,8-dihydro-1H-fluorene-9-carboxylic acid present in the skin secretion of the hippopotamus