It is a Vulcan custom for guests in the home to prepare meals for their hosts.

Of course there was no applause or any other relatively emotional outward sign of approval; that was not a Vulcan custom.

Their fingers touched, caressed each other gently in the Vulcan custom that served as an open display of affection.

That was not a Vulcan custom, he knew well enough.

You're listening to another installment of a long and ongoing battle about human versus Vulcan customs.

This is my world, and we agreed long ago that Spock would be brought up according to Vulcan custom and tradition.

She suddenly had answers to all of her questions about Vulcan marital customs.

Well aware of Vulcan customs regarding casual contact, he stopped just short of actually placing his hand on the healer's narrow shoulder.

He had wounded his mother, adopting Vulcan customs to the exclusion of human ones.

Her knowledge of Vulcan customs and traditions is im- pressive.