Definition of lethologica in English:
lethologica
noun
mass noun rare
-
The inability to remember a particular word or name.
‘he would grope for the words and he often apologized for his lethologica’
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).
Mws R Writings 