lethologica /ˌliːθəˈlɒdʒɪkə/ noun RARE noun: lethologica the inability to remember a particular word or name. Origin early 20th century: irregularly from Greek lēthē 'forgetfulness' (see Lethe) + logos 'word', with the ending in -ica probably intended to distinguish the word from others in -logia denoting a subject of study (see -logy).All Rights Reserved