Froggy Jumps Unusual 4th & 5th declension nounsOnline version Help the frog cross the pond with your knowledge of gender and unusual endings. by Robin Schweitzer 1 gender of genu (knee) a masculine b neuter c feminine 2 gender of cornu (horn) a masc b fem c neuter 3 gender of veru (spit) a masc b fem c neuter 4 gender of acus (needle) a masc b fem c neuter 5 gender of manus (hand) a masc b neuter c fem 6 gender of porticus (porch) a masc b fem c neuter 7 gender of tribus (tribe) a masc b fem c neuter 8 gender of nearly all 5th decl. nouns a masc b fem c neuter 9 dat. abl. plur of lacus a ibus b ubus c 10 dat. abl. plural of arcus (bow) a ibus b ubus c 11 dat. abl. plural of of artus, limbs (usually) a ibus b ubus c 12 dat. abl. plural of partus (offspring) a ibus b ubus c 13 dat. abl. plural of manus (hand) a ubus b ibus c 14 dat. abl. plural of genu (knee) a ubus b ibus c 15 dies etc in gen. dat. sing. has vowels: a diēī b dīēī c dīeī 16 gender of dies, used generally a fem. b masc. c neuter 17 gender of most 4th decl. nouns a fem. b masc. c neuter