Informal greetings are typically used in casual conversations between friends and family. The crossword solutions for the term 'informal greeting' include 'Hullo' (5 letters), 'Hiya' (4 letters), 'HEY' (3 letters), 'Howdy' (5 letters), 'Hiho' (4 letters), 'Wave' (4 letters), 'Higuy' (5 letters), 'Howdo' (5 letters), 'YooHoo' (6 letters), 'Hithre' (7 letters), 'Heythere' (8 letters), 'Howareya' (8 letters), 'Howgoesit' (9 letters), and 'Whatscooking' (12 letters). These terms are all used to express a friendly greeting in an informal setting.