HOW TO DECLINE? – A SUMMARY

1) VENA_1ST DECLENSION fem.                          + feminine adjectives ending in -a

Gender exceptions: diabetes, ae, m.                                         superlative forms
(-issima)

                                 ascites, ae, m.

Greek: systole, es (Acc. -en, Abl. –e)
r(h)aphe, es
dyspnoe, es

2a) NERVUS_2ND DECLENSION masc.               + masculine adectives ending in –us/er

Gender exceptions: methodus, i ,f.,                                          superlative forms
(-issimus)

                                 diameter, tri, f.,

                                 periodus, i, f.
                                 alvus, i, f.

                                 virus, i, n.

Greek: nephros, i, m.

2b) SEPTUM:2ND DECLENSION neutr.               + neutral adjectives  ending in -um

Greek: colon, i, n.                                                                    superlative
forms (-issimum)


3a) DOLOR _3RD DECLENSION  masc. + fem.   + m./f. comparative forms ending in -ior

*PELVIS (i.e. Gen. Pl. –ium) if:

the same number of syllables in Nom. and Gen.                     e.g. avis, pubes, cutis, axis,
canalis

two consonants in Gen. stem                                                   e.g. dens, fons,
mons, pons

+ m. + f. adjectives of 3rd decl. (typically ending in –is + one-form adj. like simplex, teres,
biceps, perforans, etc.)

3b) CORPUS_3RD DECLENSION neutr.              + n. comparative forms ending in -ius

*vas, is, n.: Pl. like septum

*RETE (e.g. Abl.sg.: -i; Nom.= Acc.pl. –ia; Gen. pl. –ium) if:

cochlear, calcar, animal

n. 3rd declension adjectives

3c) DOSIS _3RD DECLENSION Greek fem.

ending in -sis, -xis, -osis + febris, sitis, (per)tussis
Gen.sg.:-eos/–is; Acc.sg-: -in/-im

4a) DUCTUS_4TH DECLENSION masc.

 Gender exception: manus, us, f.

4b) GENU_4TH DECLENSION neutr.

genu, us, n.; cornu, us, n.


5) FACIES_5TH DECLENSION fem.

*species, erum, f.