What does fossōrium mean in Latin?

fossōrium, a noun, means “a spade, an implement for digging”.

What is the genitive of fossōrium?

The genitive singular is fossōriī. fossōrium is neuter, second declension.

noun · neutersecond declension

fossōrium n (genitive fossōriī or fossōrī)

EarlyLate LatinMedieval Latina spade, an implement for digging
Scudicia dicta eo, quod circa codicem terram aperiat; et quamvis eius usus in reliquis operibus habeatur, nomen tamen ex codice retinet. hanc alii generaliter fossorium vocant, quasi fovessorium.1967 translation by K. D. White The scudicia is so called because it opens the earth around the base (of the plant); and although it is used for other operations, it still retains its name from the base (codex). Others commonly call it a trenching tool, as if the word were derived from fovea (a hole).early 7th c. CE, Isidore of Seville, Etymologiae sive Origines 20.14.7
Sarculum, sarpa vel fossoriumc. 1264, Vincent of Beauvais, Speculum doctrinale:

From fodiō (“to dig, dig up”) + -tōrium, or nominalized from the neuter of fossōrius.