First entry:

http://dictionary.goo.ne.jp/leaf/jn2/168628/m0u/%E3%81%AB%E3%82%89/

The header line of this entry is:

にら・む【×睨む】

What is that little × doing in there? Is it there because that kanji isn’t one of the official ones?

Then the first line of the entry itself is this:

［動マ五（四）］

I’m guessing that is something about the grammatical type of the word, but I can’t look up what it means.

Then come the actual definitions. Here is the first one.

１ 目をいからしてじっと見る。鋭い目つきで見る。「じろりと―・む」

What is the part in brackets at the end?

Second entry:

http://dictionary.goo.ne.jp/leaf/jn2/214122/m0u/%E8%A6%8B%E3%82%8B/

The header says:

みる【見る／▽視る／▽観る】

What are those triangles?

And then there is:

［動マ上一］［文］［マ上一］

What is that?

https://plus.google.com/u/0/101848191156408080085/posts/8WRW6e6v6zy

Also got sent this link on Twitter:

http://dictionary.goo.ne.jp/help/jn/03_02.html
http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q105007965

Basically, × shows that the kanji is not a standard use Jyouyou kanji. ▽ shows that the reading is not in the list of Jyouyou kanji.

１ 目をいからしてじっと見る。鋭い目つきで見る。「じろりと―・む」

This is a usage example: じろりと睨む. The ― shows where to use the kanji.

動 means ‘verb’ (動詞)
マ means the verb is from the ma,mi,mu,me,mo list
五 means it is a ‘Godan’ verb (grammatical expression)
（四） means it is ‘Yodan’ verb in old Japanese.

Still checking about 動マ上一…

Say thanks to the guys in the Google Plus thread. They are awesome at Japanese :)

Cheers!