An old-fashioned nickname or informal name, historically used as a term for a girl or young woman, sometimes spelled Gertie or Gerty.
A diminutive form of 'Gertrude,' a Germanic name meaning 'spear strength' (from 'ger' meaning spear and 'trud' meaning strength). Popular as a nickname in English-speaking countries, especially in the early 20th century.
Gertie was such a popular name that it became slang for a 'thing' or 'gadget' in some regions—people would say 'hand me that gertie' the way you might say 'hand me that doohickey' today!
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