Ingvaeonicn.

1907 H. M. Chadwick Origin Eng. Nation ix. 222 The identification of the Inguaeones with the Anglo-Frisian group rests on the assumption that languages of this type were once spoken in the western Baltic, a hypothesis for which no solid evidence has been produced.]

1933 L. Bloomfield Lang. iv. 58 We conclude that English is an offshoot of an Anglo-Frisian (or Ingweonic) dialect area, which must have been fairly extensive before the migration to Britain.

1939 Trans. Philol. Soc. 87 Sporadic cases of ō for ‘Ingvaeonic’ ą̄ occur in OSax.

1948 Neophilologus 32 176 The pronounced Inguaeonic characteristics of early Low German sources.

1948 Neophilologus 32 181 The oldest Germanic language of the Dutch area is thus understood to have been primitive Inguaeonic.

1948 Trans. Philol. Soc. 1947 14 The original Germanic language of the Low German area was not in any essential matter distinguished from Frisian... In that original state it formed with English a loose unity..having in a common articulation potentialities for common developments... This loose unity we may call Ingvaeonic.

1959 A. Campbell Old Eng. Gram. §4 This West Germanic without Old High German is often called ‘Ingvaeonic’, because in Tacitus' threefold division of the Germans the Ingvaeones lie near the sea.