Dictionary.net

• The large individual of a conjugating pair, as the ordinary sedentary Vorticellan to which the motile microconjugant or individual attaches itself.

1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.

• [Greek] The larger individual of a conjugating pair.

1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth