To invade or penetrate a tissue or organ.
To cause to penetrate in this way.
To surreptitiously penetrate, enter or gain access to.
To send (soldiers, spies, etc.) through gaps in the enemy line.
To pass through something by filtration.
To move from a vein, remaining in the body.
To cause (a liquid) to pass through something by filtration.
Any undesirable substance or group of cells that has made its way into part of the body.
To insert a substance between two or more molecules, bases, cells, or tissues.
To insert an extra month into a calendar for the same purpose. The Hebrew calendar has such a month.
To insert an extra leap day into a calendar in order to maintain synchrony with natural phenomena.
To insert anything somewhere (especially between other things), such as an affix into a word. (Compare interpolate.)