Found the following hamletworks.org entries referring to line 3732
View Commentary Note for 3731, etc.
3731
The King shall drinke to Hamlets better breath,
5.2.271
3732
And in the cup an
{Onixe}
<vnion>
shall he throwe,
5.2.272
View Immaterial Textual Note for 3731, etc.
3731
The King shall drinke to Hamlets better breath,
5.2.271
3732
And in the cup an
{Onixe}
<vnion>
shall he throwe,
5.2.272
View Material Textual Note for 3731, etc.
3731
The King shall drinke to Hamlets better breath,
5.2.271
3732
And in the cup an
{Onixe}
<vnion>
shall he throwe,
5.2.272