solder

noun

1. (countable, uncountable)Any of various easily melted alloys, commonly of tin and lead, that are used to mend, coat, or join metal objects, usually small.

   “...the packaging of electronic components has moved from technology that used solder predominantly as an electrical connection (plated through-hole) to technology that uses solder as both a mechanical and electrical connection (surface mount technology)...”

   “I've had so little feeling that I've burned myself with liquid solder and watched my skin burn and not felt anything.”

2. (countable, figuratively, uncountable)Circumstances or emotions that strongly bond things or persons together, by analogy to solder that joins metals.

   “Friendship! Mysterious cement of the soul — and solder of society.”

verb

1. To join items together, or to coat them with solder.
2. (figuratively)To join things as if with solder.

   “In the days that followed Nick's death I was in severe shock. I was shattered both physically and emotionally... I seemed to be living in slow motion, waiting for the fragmented parts of my body and mind to solder themselves together.”