oecologicus
oecologicus, oecologica, oecologicum
adj. ecological;

oecologista
oecologista, oecologistae
n. f. environmentalist;

oeconomia
oeconomia, oeconomiae
n. f. arrangement, division; economy (Cal);

oeconomicus
oeconomicus, oeconomica, oeconomicum
adj. relating to domestic economy; orderly, methodical; economic;

oeconomus
oeconomus, oeconomi
n. m. steward (Erasmus); arranger/manager;

oecosystema
oecosystema, oecosystematis
n. n. ecosystem;

oecumenicus
oecumenicus, oecumenica, oecumenicum
adj. ecumenical;

oecumenismus
oecumenismus, oecumenismi
n. m. ecumenism;

oenococtus
oenococtus, oenococta, oenococtum
adj. stewed-in-wine;

oenophorum
oenophorum, oenophori
n. n. basket for wine;

oestrus
oestrus, oestri
n. m. gad-fly;

oesypum
oesypum, oesypi
n. n. cosmetic; grease from unwashed wool (used in medicine/cosmetics); (lanolin?);